ratonrat | LynxFyxPayload[.]exe

resource	yara_rule
sample	family_ratonrat

resource	yara_rule
sample	costura

resource
LynxFyxPayload.exe
unpack001/costura.dll
unpack001/stuff.dll

LynxFyxPayload.exe

IMPHASH f34d5f2d4577ed6d9ceec516c1f5a744
SHA256 5760552963c066ee4c433ab2d8468286afb83f082ed44bcc81e4d8d70f13ff7f
MD5 366861670ec7a2cd0ecff16d9208075e
SHA1 e9e4ec447f4738293a6cb75506d0aaf61f0d5332
SHA512 017e4cf3803f66e92e0bc43bbfbeca66738a5df86988d9c3f7723db7f64fa80d9b8b68a79bff0e09122ed3a886e7e7558e29287a66a4bec360ef4cbdfe870a10
SSDEEP 12288:3Y1R3374rIkzE7tnXknXQaBFJi4RkTAJ0MK86WoLb66OPfD9piIlBk:gL4kkA7lXkXDDuAOFhWSApip
TLSH
T1EBD40204B7FC3616FBFE8B3E59F091480EB2B2538A20D25C5D83D4A91675B429D24FA7
MD5 SHA1 SHA512 SSDEEP TLSH

windows:4 windows x86 arch:x86

Detects RatonRAT payload
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

0

Major OS version

4

Entry point

614270

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

costura.dll

IMPHASH dae02f32a21e03ce65412f6e56942daa
SHA256 7a9e767ad824afa2c1b0aed513fe1cf2b8dac6d40f24e7c4075af32b1cf23a20
MD5 109bd38d2107f41573c48544992ead99
SHA1 028e9832f421f11f9497c610f1734e0f3d868037
SHA512 459945f338679c77acca8f1192907cd3ce8e19f270589d34ce8227b8eaf0c7c8c9922e52b8310d037c4d5c0c639de42a6e3b0f7d44d493fc50644b6fcf7cd4e5
SSDEEP 48:6gMX2nhx3BTjtRiaAVLEP4iZ6iMtTg70uElaQ40JFuUPtomCH9gWk1qyFVA2IbS:HHtRYVLEmYZEZ9ruUPqJmW/2
TLSH
T10BB1FB2867B8573BEF7B4BB65863534257B4B950CC279B1F0985B3166C223544931732
MD5 SHA1 SHA512 SSDEEP TLSH

windows:4 windows x86 arch:x86

Detects RatonRAT payload
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

0

Major OS version

4

Entry point

11030

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\274459\Source\Costura_Fody\src\Costura\obj\Release\netstandard2.0\Costura.pdb

costura.pdb

SHA256 fbb47bfd057253e9461bc7fe661eb8ad273451782f3e227b8db8f88b54cea186
MD5 dd3394a0ba6f7158d029e1c3a31b7a85
SHA1 806f4c19b2d7fd9e3b836269ec07647019a29e95
SHA512 2fbedae58d16bfe20954094e5c7541e1b25310107571e94f7bea35b2217aa634197ef147afb9ffbd9c59aa0f7e209cf2a97349c3503077758502bf7a776e2575
SSDEEP 192:yMD/wix+PI6jMai+NLy5nj4SCBg5MRkCIFQkC8g7AHOuXk/N/8Hu04:y8YPI6jMai+NLy5nj4SCm5Mz6QkOAHO/
TLSH
T1A4F1B33F5748C463C89959720521C49CB6B343202670ED78F3DB2608EDAF69AC7B5772
MD5 SHA1 SHA512 SSDEEP TLSH

Detects RatonRAT payload
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

stuff.dll

IMPHASH dae02f32a21e03ce65412f6e56942daa
SHA256 d8ee0fc96ce8de2e37bc8fdc051da7c1852b9a510270e663ba17281de23f049b
MD5 f8d5274e3368aa40cc0fd5798d19c783
SHA1 87f87d8c2b468fb87d82c3f5a849936c08d7a67c
SHA512 fa3f106d4ab31c0d516b4623f3108b29c05993a6e65e6e1f1a49e7d101860f78c63843743c3e560c2891fccade27e6024e7b1566d4b99dd0fa90480c1d1a45bc
SSDEEP 192:cl/e0xEXKl04vygxTppSYgDnWgdCpZ8u8u8u8u8u8u8u8u2JHqW6LvEX6KSf5V00:cl/nxEXKl04vygkJ9dddddddBAW6AX6d
TLSH
T15D42192DB784866FD96C0B3EB86622541772EA30AE63DF8F1CC4B03E7D6735885505B8
MD5 SHA1 SHA512 SSDEEP TLSH

windows:4 windows x86 arch:x86

Detects RatonRAT payload
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

0

Major OS version

4

Entry point

18306

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:\Users\Cristian\source\repos\Stuff\Stuff\obj\Debug\Stuff.pdb

stuff.pdb

SHA256 5a3d0e35dd6e13324b0edff9039c9f56bebe485bfcb111a3d4a75e66c0f561c3
MD5 2747cbc9ab74e2f10603ca8414632128
SHA1 8c8fa0185a2cb3bb863e5db51b6bd354a2920b8e
SHA512 bf4c1f5abc3720357cd472fb1538e3d9c07a2cda9a365d290257be79ddf040128df6325e6d8cb0d91c85862d5c4e9c4dce3cf557fc9de5865364646c5fcabea9
SSDEEP 768:q83r3aOQJWT2NpMTr45hGYjUwYsqh5qOQJWT2Bpv:kpMT6Gpwuh5+p
TLSH
T1A2334E07B780DEB3D456463831A78F5C4778EC10AB86E34F23AABA3C7EB1B590D51598
MD5 SHA1 SHA512 SSDEEP TLSH

Detects RatonRAT payload
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

system.buffers.dll

IMPHASH dae02f32a21e03ce65412f6e56942daa
SHA256 accccfbe45d9f08ffeed9916e37b33e98c65be012cfff6e7fa7b67210ce1fefb
MD5 ecdfe8ede869d2ccc6bf99981ea96400
SHA1 2f410a0396bc148ed533ad49b6415fb58dd4d641
SHA512 5fc7fee5c25cb2eee19737068968e00a00961c257271b420f594e5a0da0559502d04ee6ba2d8d2aad77f3769622f6743a5ee8dae23f8f993f33fb09ed8db2741
SSDEEP 384:/rMdp9yXOfPfAxR5zwWvYW8a2cyHRN7vCvlbLg:/rMcXP6N6e
TLSH
T156926D12DBAC4213DE3B2E7012A4C9C62E3AD3C66A11DB5E1848F5591ED37CACF11B6D
MD5 SHA1 SHA512 SSDEEP TLSH

windows:4 windows x86 arch:x86

Detects RatonRAT payload
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

d4:65:dc:35:86:93:2f:fb:0d:d0:c1:ac:2f:31:92:bd:28:75:14:21:57:3f:3b:7d:55:33:05:32:59:3d:d4:62

Digest Algorithm

sha256

PE Digests Matches

Trusted

Signing Certificate

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

Chains

Feb 19, 2020

CN=Microsoft Corporation,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

Minor OS version

0

Major OS version

4

Entry point

17218

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

E:\A\_work\156\s\corefx\bin\obj\AnyOS.AnyCPU.Release\System.Buffers\netfx\System.Buffers.pdb

system.dll

IMPHASH dae02f32a21e03ce65412f6e56942daa
SHA256 541c6067cc69a43660d06a4f0f6eab0febcd33df9089f209d99b7ea36682a0a5
MD5 1deea6add28d3eb07c75908d57408c72
SHA1 f363829dc6bead421d88962c3944e8c041d5c5fd
SHA512 6fbb29cfa1b40c034c85c6d8499de887de9a0646de799635812d98259e85bec75c08ceb00b45af84167ee071ac7e3e2fc13d0057c9ebd0a79f0e882614a6b386
SSDEEP 12288:dZ3rUBYSL8iKNE6Rb1PwJ/Lnw17e/mY59SVFZWoMLziodEtUygRy8P6/B0OahWMC:blb1P7RY59SVFSi6EtURFUB06R/RSeB
TLSH
T1E565181133E41E6EF5E30736B97945A07A36F9C72702CF4F5060A29E1C67B83AD613A6
MD5 SHA1 SHA512 SSDEEP TLSH

windows:4 windows x86 arch:x86

Detects RatonRAT payload
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

e9:78:ec:7a:bf:21:73:f7:6e:a7:34:c5:a2:5e:a7:d4:d9:5c:a7:56:36:45:97:43:58:a1:07:45:ab:6f:94:7e

Digest Algorithm

sha256

PE Digests Matches

Trusted

Signing Certificate

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

Chains

Mar 26, 2018

CN=Microsoft Corporation,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

8a:1d:ed:75:0a:5b:33:7e:2f:b9:7a:5b:8e:66:d6:53:15:c0:c6:2b

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

Mar 26, 2018

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

Subject

CN=Microsoft Time-Stamp Service,OU=AOC+OU=nCipher DSE ESN:7AB5-2DF2-DA3F,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Serial Number

33:00:00:00:c0:de:2c:3d:07:94:e4:49:79:00:00:00:00:00:c0

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

33:00:00:01:79:7c:2e:57:4e:52:e1:ca:d6:00:01:00:00:01:79

Issuer

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

Ext Key Usages

ExtKeyUsageCodeSigning

Timespan

Aug 11, 2017 - Aug 11, 2018

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,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Serial Number

33:00:00:00:c4:e9:89:f8:7a:81:50:e9:ff:00:00:00:00:00:c4

Issuer

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

Ext Key Usages

ExtKeyUsageCodeSigning

Timespan

Aug 11, 2017 - Aug 11, 2018

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=AOC+OU=Thales TSS ESN:96FF-4BC5-A7DC,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US

Serial Number

33:00:00:00:b6:8b:47:43:b2:cc:ad:1f:04:00:00:00:00:00:b6

Issuer

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

Ext Key Usages

ExtKeyUsageTimeStamping

Timespan

Oct 2, 2017 - Jan 2, 2019

Minor OS version

0

Major OS version

4

Entry point

1435946

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

LynxFyxPayload.exe

mscoree

dotnet

costura.dll

mscoree

dotnet

costura.pdb

stuff.dll

mscoree

dotnet

stuff.pdb

system.buffers.dll

mscoree

dotnet

system.dll

PE Signature issue

mscoree

dotnet

Sharing

General

Malware Config

Extracted

Signatures

File Explorer

LynxFyxPayload.exe

mscoree

dotnet

costura.dll

mscoree

dotnet

costura.pdb

stuff.dll

mscoree

dotnet

stuff.pdb

system.buffers.dll

mscoree

dotnet

system.dll

PE Signature issue

mscoree

dotnet