diff --git a/pkgs/development/tools/ilspycmd/default.nix b/pkgs/development/tools/ilspycmd/default.nix
new file mode 100644
index 000000000000..265a17f224d9
--- /dev/null
+++ b/pkgs/development/tools/ilspycmd/default.nix
@@ -0,0 +1,48 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, buildDotnetModule
+, dotnetCorePackages
+, powershell
+, autoSignDarwinBinariesHook
+, glibcLocales
+}:
+buildDotnetModule rec {
+  pname = "ilspycmd";
+  version = "8.0";
+
+  src = fetchFromGitHub {
+    owner = "icsharpcode";
+    repo = "ILSpy";
+    rev = "v${version}";
+    hash = "sha256-ERBYXgpBRXISfqBSBEydEQuD/5T1dvJ+wNg2U5pKip4=";
+  };
+
+  nativeBuildInputs = [
+    powershell
+  ] ++ lib.optionals (stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isAarch64) [ autoSignDarwinBinariesHook ];
+
+  # https://github.com/NixOS/nixpkgs/issues/38991
+  # bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
+  env.LOCALE_ARCHIVE = lib.optionalString stdenv.hostPlatform.isLinux "${glibcLocales}/lib/locale/locale-archive";
+
+  dotnet-sdk = dotnetCorePackages.sdk_6_0;
+  dotnet-runtime = dotnetCorePackages.runtime_6_0;
+
+  projectFile = "ICSharpCode.ILSpyCmd/ICSharpCode.ILSpyCmd.csproj";
+  nugetDeps = ./deps.nix;
+
+  meta = with lib; {
+    description = "Tool for decompiling .NET assemblies and generating portable PDBs";
+    homepage = "https://github.com/icsharpcode/ILSpy";
+    changelog = "https://github.com/icsharpcode/ILSpy/releases/tag/${src.rev}";
+    license = with licenses; [
+      mit
+      # third party dependencies
+      mspl
+      asl20
+    ];
+    sourceProvenance = with sourceTypes; [ fromSource binaryBytecode ];
+    maintainers = with maintainers; [ emilytrau ];
+  };
+}
diff --git a/pkgs/development/tools/ilspycmd/deps.nix b/pkgs/development/tools/ilspycmd/deps.nix
new file mode 100644
index 000000000000..f95ab0d6c4f0
--- /dev/null
+++ b/pkgs/development/tools/ilspycmd/deps.nix
@@ -0,0 +1,78 @@
+# This file was automatically generated by passthru.fetch-deps.
+# Please dont edit it manually, your changes might get overwritten!
+
+{ fetchNuGet }: [
+  (fetchNuGet { pname = "K4os.Compression.LZ4"; version = "1.3.5"; sha256 = "1nv9inhz0n25lhkw9xgp6g5xbqmcdccdhx6mwrli0pdp6hjmlh9k"; })
+  (fetchNuGet { pname = "McMaster.Extensions.CommandLineUtils"; version = "3.1.0"; sha256 = "075n1mfsxwz514r94l8i3ax0wp43c3xb4f9w25a96h6xxnj0k2hd"; })
+  (fetchNuGet { pname = "Microsoft.Build.Tasks.Git"; version = "1.1.1"; sha256 = "1bb5p4zlnfn88skkvymxfsn0jybqncl4356hwnic9jxdq2d4fz1w"; })
+  (fetchNuGet { pname = "Microsoft.NETCore.App.Ref"; version = "6.0.0"; sha256 = "1skgkralqkg2srvgvrmbsmya67f37gzk40lg28j8nz5mg8k8g0ia"; })
+  (fetchNuGet { pname = "Microsoft.NETCore.Platforms"; version = "1.1.0"; sha256 = "08vh1r12g6ykjygq5d3vq09zylgb84l63k49jc4v8faw9g93iqqm"; })
+  (fetchNuGet { pname = "Microsoft.NETCore.Targets"; version = "1.1.0"; sha256 = "193xwf33fbm0ni3idxzbr5fdq3i2dlfgihsac9jj7whj0gd902nh"; })
+  (fetchNuGet { pname = "Microsoft.SourceLink.Common"; version = "1.1.1"; sha256 = "0xkdqs7az2cprar7jzjlgjpd64l6f8ixcmwmpkdm03fyb4s5m0bg"; })
+  (fetchNuGet { pname = "Microsoft.SourceLink.GitHub"; version = "1.1.1"; sha256 = "099y35f2npvva3jk1zp8hn0vb9pwm2l0ivjasdly6y2idv53s5yy"; })
+  (fetchNuGet { pname = "Mono.Cecil"; version = "0.11.4"; sha256 = "1yxa7mh432s7g7p9r7scqxvxjk5ypwc567qdbf0gmk8fbf0d3f8y"; })
+  (fetchNuGet { pname = "NETStandard.Library"; version = "2.0.3"; sha256 = "1fn9fxppfcg4jgypp2pmrpr6awl3qz1xmnri0cygpkwvyx27df1y"; })
+  (fetchNuGet { pname = "runtime.any.System.Collections"; version = "4.3.0"; sha256 = "0bv5qgm6vr47ynxqbnkc7i797fdi8gbjjxii173syrx14nmrkwg0"; })
+  (fetchNuGet { pname = "runtime.any.System.Globalization"; version = "4.3.0"; sha256 = "1daqf33hssad94lamzg01y49xwndy2q97i2lrb7mgn28656qia1x"; })
+  (fetchNuGet { pname = "runtime.any.System.IO"; version = "4.3.0"; sha256 = "0l8xz8zn46w4d10bcn3l4yyn4vhb3lrj2zw8llvz7jk14k4zps5x"; })
+  (fetchNuGet { pname = "runtime.any.System.Reflection"; version = "4.3.0"; sha256 = "02c9h3y35pylc0zfq3wcsvc5nqci95nrkq0mszifc0sjx7xrzkly"; })
+  (fetchNuGet { pname = "runtime.any.System.Reflection.Primitives"; version = "4.3.0"; sha256 = "0x1mm8c6iy8rlxm8w9vqw7gb7s1ljadrn049fmf70cyh42vdfhrf"; })
+  (fetchNuGet { pname = "runtime.any.System.Resources.ResourceManager"; version = "4.3.0"; sha256 = "03kickal0iiby82wa5flar18kyv82s9s6d4xhk5h4bi5kfcyfjzl"; })
+  (fetchNuGet { pname = "runtime.any.System.Runtime"; version = "4.3.0"; sha256 = "1cqh1sv3h5j7ixyb7axxbdkqx6cxy00p4np4j91kpm492rf4s25b"; })
+  (fetchNuGet { pname = "runtime.any.System.Runtime.Handles"; version = "4.3.0"; sha256 = "0bh5bi25nk9w9xi8z23ws45q5yia6k7dg3i4axhfqlnj145l011x"; })
+  (fetchNuGet { pname = "runtime.any.System.Runtime.InteropServices"; version = "4.3.0"; sha256 = "0c3g3g3jmhlhw4klrc86ka9fjbl7i59ds1fadsb2l8nqf8z3kb19"; })
+  (fetchNuGet { pname = "runtime.any.System.Text.Encoding"; version = "4.3.0"; sha256 = "0aqqi1v4wx51h51mk956y783wzags13wa7mgqyclacmsmpv02ps3"; })
+  (fetchNuGet { pname = "runtime.any.System.Text.Encoding.Extensions"; version = "4.3.0"; sha256 = "0lqhgqi0i8194ryqq6v2gqx0fb86db2gqknbm0aq31wb378j7ip8"; })
+  (fetchNuGet { pname = "runtime.any.System.Threading.Tasks"; version = "4.3.0"; sha256 = "03mnvkhskbzxddz4hm113zsch1jyzh2cs450dk3rgfjp8crlw1va"; })
+  (fetchNuGet { pname = "runtime.debian.8-x64.runtime.native.System.Security.Cryptography.OpenSsl"; version = "4.3.0"; sha256 = "16rnxzpk5dpbbl1x354yrlsbvwylrq456xzpsha1n9y3glnhyx9d"; })
+  (fetchNuGet { pname = "runtime.fedora.23-x64.runtime.native.System.Security.Cryptography.OpenSsl"; version = "4.3.0"; sha256 = "0hkg03sgm2wyq8nqk6dbm9jh5vcq57ry42lkqdmfklrw89lsmr59"; })
+  (fetchNuGet { pname = "runtime.fedora.24-x64.runtime.native.System.Security.Cryptography.OpenSsl"; version = "4.3.0"; sha256 = "0c2p354hjx58xhhz7wv6div8xpi90sc6ibdm40qin21bvi7ymcaa"; })
+  (fetchNuGet { pname = "runtime.native.System"; version = "4.3.0"; sha256 = "15hgf6zaq9b8br2wi1i3x0zvmk410nlmsmva9p0bbg73v6hml5k4"; })
+  (fetchNuGet { pname = "runtime.native.System.IO.Compression"; version = "4.3.0"; sha256 = "1vvivbqsk6y4hzcid27pqpm5bsi6sc50hvqwbcx8aap5ifrxfs8d"; })
+  (fetchNuGet { pname = "runtime.native.System.Security.Cryptography.OpenSsl"; version = "4.3.0"; sha256 = "18pzfdlwsg2nb1jjjjzyb5qlgy6xjxzmhnfaijq5s2jw3cm3ab97"; })
+  (fetchNuGet { pname = "runtime.opensuse.13.2-x64.runtime.native.System.Security.Cryptography.OpenSsl"; version = "4.3.0"; sha256 = "0qyynf9nz5i7pc26cwhgi8j62ps27sqmf78ijcfgzab50z9g8ay3"; })
+  (fetchNuGet { pname = "runtime.opensuse.42.1-x64.runtime.native.System.Security.Cryptography.OpenSsl"; version = "4.3.0"; sha256 = "1klrs545awhayryma6l7g2pvnp9xy4z0r1i40r80zb45q3i9nbyf"; })
+  (fetchNuGet { pname = "runtime.osx.10.10-x64.runtime.native.System.Security.Cryptography.OpenSsl"; version = "4.3.0"; sha256 = "0zcxjv5pckplvkg0r6mw3asggm7aqzbdjimhvsasb0cgm59x09l3"; })
+  (fetchNuGet { pname = "runtime.rhel.7-x64.runtime.native.System.Security.Cryptography.OpenSsl"; version = "4.3.0"; sha256 = "0vhynn79ih7hw7cwjazn87rm9z9fj0rvxgzlab36jybgcpcgphsn"; })
+  (fetchNuGet { pname = "runtime.ubuntu.14.04-x64.runtime.native.System.Security.Cryptography.OpenSsl"; version = "4.3.0"; sha256 = "160p68l2c7cqmyqjwxydcvgw7lvl1cr0znkw8fp24d1by9mqc8p3"; })
+  (fetchNuGet { pname = "runtime.ubuntu.16.04-x64.runtime.native.System.Security.Cryptography.OpenSsl"; version = "4.3.0"; sha256 = "15zrc8fgd8zx28hdghcj5f5i34wf3l6bq5177075m2bc2j34jrqy"; })
+  (fetchNuGet { pname = "runtime.ubuntu.16.10-x64.runtime.native.System.Security.Cryptography.OpenSsl"; version = "4.3.0"; sha256 = "1p4dgxax6p7rlgj4q73k73rslcnz4wdcv8q2flg1s8ygwcm58ld5"; })
+  (fetchNuGet { pname = "runtime.unix.System.Diagnostics.Debug"; version = "4.3.0"; sha256 = "1lps7fbnw34bnh3lm31gs5c0g0dh7548wfmb8zz62v0zqz71msj5"; })
+  (fetchNuGet { pname = "runtime.unix.System.Private.Uri"; version = "4.3.0"; sha256 = "1jx02q6kiwlvfksq1q9qr17fj78y5v6mwsszav4qcz9z25d5g6vk"; })
+  (fetchNuGet { pname = "runtime.unix.System.Runtime.Extensions"; version = "4.3.0"; sha256 = "0pnxxmm8whx38dp6yvwgmh22smknxmqs5n513fc7m4wxvs1bvi4p"; })
+  (fetchNuGet { pname = "System.Buffers"; version = "4.5.1"; sha256 = "04kb1mdrlcixj9zh1xdi5as0k0qi8byr5mi3p3jcxx72qz93s2y3"; })
+  (fetchNuGet { pname = "System.Collections"; version = "4.3.0"; sha256 = "19r4y64dqyrq6k4706dnyhhw7fs24kpp3awak7whzss39dakpxk9"; })
+  (fetchNuGet { pname = "System.Collections.Immutable"; version = "6.0.0"; sha256 = "1js98kmjn47ivcvkjqdmyipzknb9xbndssczm8gq224pbaj1p88c"; })
+  (fetchNuGet { pname = "System.Collections.Immutable"; version = "7.0.0"; sha256 = "1n9122cy6v3qhsisc9lzwa1m1j62b8pi2678nsmnlyvfpk0zdagm"; })
+  (fetchNuGet { pname = "System.ComponentModel.Annotations"; version = "5.0.0"; sha256 = "021h7x98lblq9avm1bgpa4i31c2kgsa7zn4sqhxf39g087ar756j"; })
+  (fetchNuGet { pname = "System.Composition"; version = "6.0.0"; sha256 = "1p7hysns39cc24af6dwd4m48bqjsrr3clvi4aws152mh2fgyg50z"; })
+  (fetchNuGet { pname = "System.Composition.AttributedModel"; version = "6.0.0"; sha256 = "1mqrblb0l65hw39d0hnspqcv85didpn4wbiwhfgj4784wzqx2w6k"; })
+  (fetchNuGet { pname = "System.Composition.Convention"; version = "6.0.0"; sha256 = "02km3yb94p1c4s7liyhkmda0g71zm1rc8ijsfmy4bnlkq15xjw3b"; })
+  (fetchNuGet { pname = "System.Composition.Hosting"; version = "6.0.0"; sha256 = "0big5nk8c44rxp6cfykhk7rxvn2cgwa99w6c3v2a36adc3lj36ky"; })
+  (fetchNuGet { pname = "System.Composition.Runtime"; version = "6.0.0"; sha256 = "0vq5ik63yii1784gsa2f2kx9w6xllmm8b8rk0arid1jqdj1nyrlw"; })
+  (fetchNuGet { pname = "System.Composition.TypedParts"; version = "6.0.0"; sha256 = "0y9pq3y60nyrpfy51f576a0qjjdh61mcv8vnik32pm4bz56h9q72"; })
+  (fetchNuGet { pname = "System.Diagnostics.Debug"; version = "4.3.0"; sha256 = "00yjlf19wjydyr6cfviaph3vsjzg3d5nvnya26i2fvfg53sknh3y"; })
+  (fetchNuGet { pname = "System.Globalization"; version = "4.3.0"; sha256 = "1cp68vv683n6ic2zqh2s1fn4c2sd87g5hpp6l4d4nj4536jz98ki"; })
+  (fetchNuGet { pname = "System.IO"; version = "4.3.0"; sha256 = "05l9qdrzhm4s5dixmx68kxwif4l99ll5gqmh7rqgw554fx0agv5f"; })
+  (fetchNuGet { pname = "System.IO.Compression"; version = "4.3.0"; sha256 = "084zc82yi6yllgda0zkgl2ys48sypiswbiwrv7irb3r0ai1fp4vz"; })
+  (fetchNuGet { pname = "System.IO.FileSystem.Primitives"; version = "4.3.0"; sha256 = "0j6ndgglcf4brg2lz4wzsh1av1gh8xrzdsn9f0yznskhqn1xzj9c"; })
+  (fetchNuGet { pname = "System.Memory"; version = "4.5.4"; sha256 = "14gbbs22mcxwggn0fcfs1b062521azb9fbb7c113x0mq6dzq9h6y"; })
+  (fetchNuGet { pname = "System.Numerics.Vectors"; version = "4.4.0"; sha256 = "0rdvma399070b0i46c4qq1h2yvjj3k013sqzkilz4bz5cwmx1rba"; })
+  (fetchNuGet { pname = "System.Private.Uri"; version = "4.3.0"; sha256 = "04r1lkdnsznin0fj4ya1zikxiqr0h6r6a1ww2dsm60gqhdrf0mvx"; })
+  (fetchNuGet { pname = "System.Reflection"; version = "4.3.0"; sha256 = "0xl55k0mw8cd8ra6dxzh974nxif58s3k1rjv1vbd7gjbjr39j11m"; })
+  (fetchNuGet { pname = "System.Reflection.Metadata"; version = "6.0.0"; sha256 = "1x0b289r9yjzdqypi2x3dc8sa66s3b6bpc7l2f8hxrzl6czdg4al"; })
+  (fetchNuGet { pname = "System.Reflection.Metadata"; version = "7.0.0"; sha256 = "1wilasn2qmj870h2bhw348lspamm7pbinpb4m89icg113510l00v"; })
+  (fetchNuGet { pname = "System.Reflection.Primitives"; version = "4.3.0"; sha256 = "04xqa33bld78yv5r93a8n76shvc8wwcdgr1qvvjh959g3rc31276"; })
+  (fetchNuGet { pname = "System.Resources.ResourceManager"; version = "4.3.0"; sha256 = "0sjqlzsryb0mg4y4xzf35xi523s4is4hz9q4qgdvlvgivl7qxn49"; })
+  (fetchNuGet { pname = "System.Runtime"; version = "4.3.0"; sha256 = "066ixvgbf2c929kgknshcxqj6539ax7b9m570cp8n179cpfkapz7"; })
+  (fetchNuGet { pname = "System.Runtime.CompilerServices.Unsafe"; version = "6.0.0"; sha256 = "0qm741kh4rh57wky16sq4m0v05fxmkjjr87krycf5vp9f0zbahbc"; })
+  (fetchNuGet { pname = "System.Runtime.Extensions"; version = "4.3.0"; sha256 = "1ykp3dnhwvm48nap8q23893hagf665k0kn3cbgsqpwzbijdcgc60"; })
+  (fetchNuGet { pname = "System.Runtime.Handles"; version = "4.3.0"; sha256 = "0sw2gfj2xr7sw9qjn0j3l9yw07x73lcs97p8xfc9w1x9h5g5m7i8"; })
+  (fetchNuGet { pname = "System.Runtime.InteropServices"; version = "4.3.0"; sha256 = "00hywrn4g7hva1b2qri2s6rabzwgxnbpw9zfxmz28z09cpwwgh7j"; })
+  (fetchNuGet { pname = "System.Runtime.Loader"; version = "4.3.0"; sha256 = "07fgipa93g1xxgf7193a6vw677mpzgr0z0cfswbvqqb364cva8dk"; })
+  (fetchNuGet { pname = "System.Text.Encoding"; version = "4.3.0"; sha256 = "1f04lkir4iladpp51sdgmis9dj4y8v08cka0mbmsy0frc9a4gjqr"; })
+  (fetchNuGet { pname = "System.Text.Encoding.Extensions"; version = "4.3.0"; sha256 = "11q1y8hh5hrp5a3kw25cb6l00v5l5dvirkz8jr3sq00h1xgcgrxy"; })
+  (fetchNuGet { pname = "System.Threading"; version = "4.3.0"; sha256 = "0rw9wfamvhayp5zh3j7p1yfmx9b5khbf4q50d8k5rk993rskfd34"; })
+  (fetchNuGet { pname = "System.Threading.Tasks"; version = "4.3.0"; sha256 = "134z3v9abw3a6jsw17xl3f6hqjpak5l682k2vz39spj4kmydg6k7"; })
+  (fetchNuGet { pname = "TunnelVisionLabs.ReferenceAssemblyAnnotator"; version = "1.0.0-alpha.160"; sha256 = "1wvfa3098a984kydjgjvx43gncnr89fw20if2gqvz8kqn9pxqjbq"; })
+]
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 6b9329c34cd2..153e2c3c691e 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9015,6 +9015,10 @@ with pkgs;
 
   ike-scan = callPackage ../tools/security/ike-scan { };
 
+  ilspycmd = callPackage ../development/tools/ilspycmd {
+    inherit (darwin) autoSignDarwinBinariesHook;
+  };
+
   imapsync = callPackage ../tools/networking/imapsync { };
 
   imgur-screenshot = callPackage ../tools/graphics/imgur-screenshot { };