a65c89eb77e80859ae06282f65c0df229c09decd34ffb53fa9827b25043acbff[.]exe

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General

Target
a65c89eb77e80859ae06282f65c0df229c09decd34ffb53fa9827b25043acbff.exe
Size 101KB
Sample261022-2drsaaav3n
SHA256 a65c89eb77e80859ae06282f65c0df229c09decd34ffb53fa9827b25043acbff
MD5 20b7b3f0efc545ada0587d0831795970
SHA1 cb5f78e3c6615ce5256992e243ed039b11b0fc7d
SHA512 50494998628f005776b32f4bfb72724842c6fdd6f17eed69d1421dd587ff589ce4af02d3da9ba32ebe90a4a8e5864c88ca3bfdd84ae767ab9f48de29dba78a8b
SSDEEP 1536:wzK0JKSvgiH3iSVNHg6ng8WZvj4hloBBXy/uX4:wG01gII6ng8WZvj4hloBBXy/P
TLSH
T121A38D5432D9D659C5ACCFF14CE3C273433D3DED8A0196AAB5493B7A0C326CD6B22626
MD5 SHA1 SHA512 SSDEEP TLSH

Score

4^/10

costura packer

Malware Config

Signatures

Costura .NET executable packer 1 IoCs

Costura packer aka Costura Fody, is an add-in for the .NET framework that embeds all external dependency .dll files as resources inside main executable.

costura packer

resource	yara_rule
sample	costura

Unsigned PE 2 IoCs

Checks for missing Authenticode signature.

resource
a65c89eb77e80859ae06282f65c0df229c09decd34ffb53fa9827b25043acbff.exe
unpack001/costura.dll

File Explorer

a65c89eb77e80859ae06282f65c0df229c09decd34ffb53fa9827b25043acbff.exe

.exe 101KB
costura.dll

.dll 4KB
costura.pdb

2KB
system.diagnostics.diagnosticsource.dll

.dll 34KB

a65c89eb77e80859ae06282f65c0df229c09decd34ffb53fa9827b25043acbff.exe

IMPHASH f34d5f2d4577ed6d9ceec516c1f5a744
SHA256 a65c89eb77e80859ae06282f65c0df229c09decd34ffb53fa9827b25043acbff
MD5 20b7b3f0efc545ada0587d0831795970
SHA1 cb5f78e3c6615ce5256992e243ed039b11b0fc7d
SHA512 50494998628f005776b32f4bfb72724842c6fdd6f17eed69d1421dd587ff589ce4af02d3da9ba32ebe90a4a8e5864c88ca3bfdd84ae767ab9f48de29dba78a8b
SSDEEP 1536:wzK0JKSvgiH3iSVNHg6ng8WZvj4hloBBXy/uX4:wG01gII6ng8WZvj4hloBBXy/P
TLSH
T121A38D5432D9D659C5ACCFF14CE3C273433D3DED8A0196AAB5493B7A0C326CD6B22626
MD5 SHA1 SHA512 SSDEEP TLSH

windows:4 windows x86 arch:x86

Costura .NET executable packer

Costura packer aka Costura Fody, is an add-in for the .NET framework that embeds all external dependency .dll files as resources inside main executable.

costura packer
Unsigned PE

Checks for missing Authenticode signature.

Minor OS version

Major OS version

Entry point

41150

Magic Number

267

Subsystem

IMAGE_SUBSYSTEM_WINDOWS_GUI

DLL Characteristics

IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE IMAGE_DLLCHARACTERISTICS_NX_COMPAT IMAGE_DLLCHARACTERISTICS_NO_SEH IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE

File Characteristics

IMAGE_FILE_EXECUTABLE_IMAGE IMAGE_FILE_LARGE_ADDRESS_AWARE IMAGE_FILE_32BIT_MACHINE

PDB paths

E:\dev stuff\C#\CapsSwitcher\dotnet4.8\CapsLangSwitcher\obj\Release\net48\CapsLangSwitcher.pdb

costura.dll

IMPHASH dae02f32a21e03ce65412f6e56942daa
SHA256 41bb464ac7c0d192641077e44a59d7d89860c3c620a59961f2fc4a4be47deae3
MD5 501981c7fc457d59238eb99780efb615
SHA1 f1f25c01f6acf33bdd62c4f82d3ef078e76f0906
SHA512 5921d0662add6c8aa075106878cc56335ccbf059d8bc7f359fe9e02a52ec657c3e5df1c718929564c09f205e4bd299b086f3e7424141f5e55ed0d756f65ee1e8
SSDEEP 48:6F+lni2qJfjVRPGwzCo4MhTN0KDdilETrVsH4/QWk1qyFVT2IbG:7g7KedGEiYIWM2
TLSH
T1F791A51097A8477BE9BB0FB6ACB3534A4275FA61DC27CB2F19C562172C123180A31F72
MD5 SHA1 SHA512 SSDEEP TLSH

windows:4 windows x86 arch:x86

Costura .NET executable packer

Costura packer aka Costura Fody, is an add-in for the .NET framework that embeds all external dependency .dll files as resources inside main executable.

costura packer
Unsigned PE

Checks for missing Authenticode signature.

Minor OS version

Major OS version

Entry point

10378

Magic Number

267

Subsystem

IMAGE_SUBSYSTEM_WINDOWS_CUI

DLL Characteristics

IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE IMAGE_DLLCHARACTERISTICS_NX_COMPAT IMAGE_DLLCHARACTERISTICS_NO_SEH IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE

File Characteristics

IMAGE_FILE_EXECUTABLE_IMAGE IMAGE_FILE_LARGE_ADDRESS_AWARE IMAGE_FILE_DLL

PDB paths

C:\CI_WS\Ws\198629\Source\Costura_Fody\src\Costura\obj\Release\netstandard1.0\Costura.pdb

system.diagnostics.diagnosticsource.dll

IMPHASH dae02f32a21e03ce65412f6e56942daa
SHA256 d22133818a30313e0becf010d78a556a56b34ea361dbd33588c9817631fed540
MD5 8d9df432109f1cfdd86723b5f171e3d7
SHA1 85dc92edd4b0049ed9049e075c4def8a3d64e43b
SHA512 5c83303934eecfa61c43a071d29c98e5804d37a5dc7f7b035772d6a168b0c5e65dfabef20b46214e65493c4bda44831cafee83615498fbe9e718c884f4650edf
SSDEEP 384:iQobG82oiaPaf/gn5LQ0+0zdQUv2CtyW8fiFISWbW9pWJbWivT1Nq0GftpBjAvnC:nA299fI5dxzL2CC11vimvnEBBNFT
TLSH
T145F25B54EBAC8953DEE71D3062A4D9423A3AEB936C10C25E2699E18D0D83BD1EB11737
MD5 SHA1 SHA512 SSDEEP TLSH

windows:4 windows x86 arch:x86

Costura .NET executable packer

Costura packer aka Costura Fody, is an add-in for the .NET framework that embeds all external dependency .dll files as resources inside main executable.

costura packer

Digest

d6:fb:4d:67:72:14:08:d2:75:46:a0:06:cb:be:f9:d3:5f:db:20:bd:97:db:cd:de:3c:cd:a0:78:2f:b1:93:7f

Digest Algorithm

sha256

PE Digests Matches

Trusted

Signing Certificate

CN=Microsoft Corporation,OU=MOPR,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Chains

Nov 5, 2016

CN=Microsoft Corporation,OU=MOPR,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

CN=Microsoft Code Signing PCA 2011,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

CN=Microsoft Root Certificate Authority 2011,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

PE Signature issue

Digest

bc:c6:7a:ba:4c:c6:19:72:95:75:c0:52:c5:b2:9c:4b:5f:0f:69:2e

Digest Algorithm

sha1

PE Digests Matches

Trusted

Not trusted

Signing Certificate

CN=Microsoft Corporation,OU=MOPR,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Chains

Nov 5, 2016

CN=Microsoft Corporation,OU=MOPR,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Subject

CN=Microsoft Time-Stamp Service,OU=MOPR+OU=nCipher DSE ESN:B1B7-F67F-FEC2,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Serial Number

33:00:00:00:c9:64:4d:16:db:1a:7d:b3:15:00:00:00:00:00:c9

Issuer

CN=Microsoft Time-Stamp PCA,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Ext Key Usages

ExtKeyUsageTimeStamping

Timespan

Sep 7, 2016 - Sep 7, 2018

Subject

CN=Microsoft Corporation,OU=MOPR,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Serial Number

33:00:00:01:40:96:a9:ee:70:56:fe:cc:07:00:01:00:00:01:40

Issuer

CN=Microsoft Code Signing PCA,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Ext Key Usages

ExtKeyUsageCodeSigning

Timespan

Aug 18, 2016 - Nov 2, 2017

Subject

CN=Microsoft Code Signing PCA,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Serial Number

61:33:26:1a:00:00:00:00:00:31

Issuer

CN=Microsoft Root Certificate Authority,0.9.2342.19200300.100.1.25=#13096d6963726f736f6674,0.9.2342.19200300.100.1.25=#1303636f6d

Key Usages

KeyUsageDigitalSignature, KeyUsageCertSign, KeyUsageCRLSign

Timespan

Aug 31, 2010 - Aug 31, 2020

Subject

CN=Microsoft Time-Stamp PCA,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Serial Number

61:16:68:34:00:00:00:00:00:1c

Issuer

CN=Microsoft Root Certificate Authority,0.9.2342.19200300.100.1.25=#13096d6963726f736f6674,0.9.2342.19200300.100.1.25=#1303636f6d

Key Usages

KeyUsageDigitalSignature, KeyUsageCertSign, KeyUsageCRLSign

Ext Key Usages

ExtKeyUsageTimeStamping

Timespan

Apr 3, 2007 - Apr 3, 2021

Subject

CN=Microsoft Corporation,OU=MOPR,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Serial Number

33:00:00:00:64:47:84:94:86:db:41:19:38:00:00:00:00:00:64

Issuer

CN=Microsoft Code Signing PCA 2011,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Ext Key Usages

ExtKeyUsageCodeSigning

Timespan

Oct 28, 2015 - Jan 28, 2017

Subject

CN=Microsoft Code Signing PCA 2011,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Serial Number

61:0e:90:d2:00:00:00:00:00:03

Issuer

CN=Microsoft Root Certificate Authority 2011,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Key Usages

KeyUsageDigitalSignature, KeyUsageCertSign, KeyUsageCRLSign

Timespan

Jul 8, 2011 - Jul 8, 2026

Subject

CN=Microsoft Time-Stamp PCA 2010,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Serial Number

61:09:81:2a:00:00:00:00:00:02

Issuer

CN=Microsoft Root Certificate Authority 2010,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Key Usages

KeyUsageDigitalSignature, KeyUsageCertSign, KeyUsageCRLSign

Timespan

Jul 1, 2010 - Jul 1, 2025

Subject

CN=Microsoft Time-Stamp Service,OU=MOPR+OU=nCipher DSE ESN:BBEC-30CA-2DBE,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Serial Number

33:00:00:00:a1:a5:fd:b9:ee:a7:fc:9e:9d:00:00:00:00:00:a1

Issuer

CN=Microsoft Time-Stamp PCA 2010,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Ext Key Usages

ExtKeyUsageTimeStamping

Timespan

Sep 7, 2016 - Sep 7, 2018

Minor OS version

Major OS version

Entry point

24690

Magic Number

267

Subsystem

IMAGE_SUBSYSTEM_WINDOWS_CUI

DLL Characteristics

IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE IMAGE_DLLCHARACTERISTICS_NX_COMPAT IMAGE_DLLCHARACTERISTICS_NO_SEH IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE

File Characteristics

IMAGE_FILE_EXECUTABLE_IMAGE IMAGE_FILE_LARGE_ADDRESS_AWARE IMAGE_FILE_DLL

PDB paths

D:\A\_work\39\s\bin\obj\AnyOS.AnyCPU.Release\System.Diagnostics.DiagnosticSource\System.Diagnostics.DiagnosticSource.pdb

a65c89eb77e80859ae06282f65c0df229c09decd34ffb53fa9827b25043acbff.exe

mscoree

dotnet

costura.dll

mscoree

dotnet

costura.pdb

system.diagnostics.diagnosticsource.dll

PE Signature issue

mscoree

dotnet