Analysis
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max time kernel
297s -
max time network
252s -
platform
windows10-1703_x64 -
resource
win10-20231025-en -
resource tags
arch:x64arch:x86image:win10-20231025-enlocale:en-usos:windows10-1703-x64system -
submitted
27-11-2023 04:52
Static task
static1
Behavioral task
behavioral1
Sample
509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe
Resource
win7-20231023-en
Behavioral task
behavioral2
Sample
509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe
Resource
win10-20231025-en
General
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Target
509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe
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Size
785KB
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MD5
ed61f850998129a23067242a868a2044
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SHA1
f5873bdd503ab43cc7c1bf7bfb9294a36bc8b74a
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SHA256
509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1
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SHA512
ee3094216838491481fc42cac3bfa518733f95e4765a7348cb43e449d74b7f58818f6fe41a4661907ae0648ef0a219a069231808a0bda6173f7677aeba7e7a41
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SSDEEP
12288:TPSJR2xS142p8hcMdkjTDcmLbJnGOXIBHHis5JZ1vJwmrShMvDZ0:KR2mTp8nocUtwnis5WwDZ0
Malware Config
Extracted
djvu
http://zexeq.com/lancer/get.php
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extension
.gycc
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offline_id
nN1rRlTxKTPo66pmJEAHwufZ2Dhz4MsNxIlOk6t1
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payload_url
http://brusuax.com/dl/build2.exe
http://zexeq.com/files/1/build3.exe
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ransomnote
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Signatures
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Detected Djvu ransomware 17 IoCs
resource yara_rule behavioral2/memory/5060-2-0x00000000025B0000-0x00000000026CB000-memory.dmp family_djvu behavioral2/memory/220-3-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/220-4-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/220-5-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/220-6-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/220-17-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/1312-21-0x0000000000A00000-0x0000000000A9E000-memory.dmp family_djvu behavioral2/memory/4536-22-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4536-23-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4536-24-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4536-29-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4536-30-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4536-34-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4536-36-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4536-37-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4536-45-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4536-52-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu -
Djvu Ransomware
Ransomware which is a variant of the STOP family.
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Downloads MZ/PE file
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Executes dropped EXE 2 IoCs
pid Process 4480 build2.exe 4080 build2.exe -
Modifies file permissions 1 TTPs 1 IoCs
pid Process 2320 icacls.exe -
Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
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Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2852493121-870915337-2715324265-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\288a16b3-1f3c-48ec-80ff-3a35ec7a4ec6\\509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe\" --AutoStart" 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe -
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
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Looks up external IP address via web service 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 1 api.2ip.ua 2 api.2ip.ua 9 api.2ip.ua -
Suspicious use of SetThreadContext 3 IoCs
description pid Process procid_target PID 5060 set thread context of 220 5060 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 70 PID 1312 set thread context of 4536 1312 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 74 PID 4480 set thread context of 4080 4480 build2.exe 76 -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
description ioc Process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 build2.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString build2.exe -
Delays execution with timeout.exe 1 IoCs
pid Process 4492 timeout.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 220 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 220 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 4536 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 4536 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 4080 build2.exe 4080 build2.exe -
Suspicious use of WriteProcessMemory 44 IoCs
description pid Process procid_target PID 5060 wrote to memory of 220 5060 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 70 PID 5060 wrote to memory of 220 5060 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 70 PID 5060 wrote to memory of 220 5060 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 70 PID 5060 wrote to memory of 220 5060 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 70 PID 5060 wrote to memory of 220 5060 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 70 PID 5060 wrote to memory of 220 5060 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 70 PID 5060 wrote to memory of 220 5060 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 70 PID 5060 wrote to memory of 220 5060 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 70 PID 5060 wrote to memory of 220 5060 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 70 PID 5060 wrote to memory of 220 5060 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 70 PID 220 wrote to memory of 2320 220 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 71 PID 220 wrote to memory of 2320 220 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 71 PID 220 wrote to memory of 2320 220 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 71 PID 220 wrote to memory of 1312 220 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 72 PID 220 wrote to memory of 1312 220 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 72 PID 220 wrote to memory of 1312 220 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 72 PID 1312 wrote to memory of 4536 1312 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 74 PID 1312 wrote to memory of 4536 1312 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 74 PID 1312 wrote to memory of 4536 1312 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 74 PID 1312 wrote to memory of 4536 1312 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 74 PID 1312 wrote to memory of 4536 1312 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 74 PID 1312 wrote to memory of 4536 1312 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 74 PID 1312 wrote to memory of 4536 1312 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 74 PID 1312 wrote to memory of 4536 1312 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 74 PID 1312 wrote to memory of 4536 1312 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 74 PID 1312 wrote to memory of 4536 1312 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 74 PID 4536 wrote to memory of 4480 4536 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 75 PID 4536 wrote to memory of 4480 4536 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 75 PID 4536 wrote to memory of 4480 4536 509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe 75 PID 4480 wrote to memory of 4080 4480 build2.exe 76 PID 4480 wrote to memory of 4080 4480 build2.exe 76 PID 4480 wrote to memory of 4080 4480 build2.exe 76 PID 4480 wrote to memory of 4080 4480 build2.exe 76 PID 4480 wrote to memory of 4080 4480 build2.exe 76 PID 4480 wrote to memory of 4080 4480 build2.exe 76 PID 4480 wrote to memory of 4080 4480 build2.exe 76 PID 4480 wrote to memory of 4080 4480 build2.exe 76 PID 4480 wrote to memory of 4080 4480 build2.exe 76 PID 4080 wrote to memory of 4664 4080 build2.exe 78 PID 4080 wrote to memory of 4664 4080 build2.exe 78 PID 4080 wrote to memory of 4664 4080 build2.exe 78 PID 4664 wrote to memory of 4492 4664 cmd.exe 80 PID 4664 wrote to memory of 4492 4664 cmd.exe 80 PID 4664 wrote to memory of 4492 4664 cmd.exe 80
Processes
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C:\Users\Admin\AppData\Local\Temp\509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe"C:\Users\Admin\AppData\Local\Temp\509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:5060 -
C:\Users\Admin\AppData\Local\Temp\509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe"C:\Users\Admin\AppData\Local\Temp\509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe"2⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:220 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\288a16b3-1f3c-48ec-80ff-3a35ec7a4ec6" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:2320
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C:\Users\Admin\AppData\Local\Temp\509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe"C:\Users\Admin\AppData\Local\Temp\509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1312 -
C:\Users\Admin\AppData\Local\Temp\509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe"C:\Users\Admin\AppData\Local\Temp\509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4536 -
C:\Users\Admin\AppData\Local\7909978e-ea0c-419b-8cd0-e8edd09ea696\build2.exe"C:\Users\Admin\AppData\Local\7909978e-ea0c-419b-8cd0-e8edd09ea696\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4480 -
C:\Users\Admin\AppData\Local\7909978e-ea0c-419b-8cd0-e8edd09ea696\build2.exe"C:\Users\Admin\AppData\Local\7909978e-ea0c-419b-8cd0-e8edd09ea696\build2.exe"6⤵
- Executes dropped EXE
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4080 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\7909978e-ea0c-419b-8cd0-e8edd09ea696\build2.exe" & del "C:\ProgramData\*.dll"" & exit7⤵
- Suspicious use of WriteProcessMemory
PID:4664 -
C:\Windows\SysWOW64\timeout.exetimeout /t 58⤵
- Delays execution with timeout.exe
PID:4492
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
Filesize1KB
MD58584329156d082b3be8cae7ce02baef4
SHA1c7442e94ba342d35f13f3afba516efae7e1e749d
SHA256b4e30b71b318a78c4055f1cae108e0c51dc945de02efbf80703d048eb1035806
SHA5126607a44d7e3e36edacc113cd56d1a95f969b27f079303ede89d3f77f5ca071f90a586f7c3731b6bebabb25de9d31dbaaadb5139ce265bda6e2b9dcf8ed2ae089
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Filesize724B
MD58202a1cd02e7d69597995cabbe881a12
SHA18858d9d934b7aa9330ee73de6c476acf19929ff6
SHA25658f381c3a0a0ace6321da22e40bd44a597bd98b9c9390ab9258426b5cf75a7a5
SHA51297ba9fceab995d4bef706f8deef99e06862999734ebe6a05832c710104479c6337cbf0a76e1c1e0f91566a61334dc100d837dfd049e20da765fe49def684f9c9
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
Filesize410B
MD502b3dc741e8d97226dd46264d8766766
SHA116af17204484ccf057da0f5af1af9996b2a6d960
SHA256e7a5b5e20dd5ec9aec54e49c77c6873b71ee02ba026a1d6299069fe57b8a2115
SHA512600932a1180aff42291c3616012867b63f27c655556b889b1bfefbd32581f0264d622c08c6c25062878bd3b892a3db345ccf07c54794544b0487da39ad40220c
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Filesize392B
MD5b832931ca84cdd0277c6f942b78e91da
SHA16790949b52529834b1e1c1148f96ed2e9d6b07ad
SHA2561ed23a29e604220c3401b5ded1d25cc29934fcb3a82cce6ed4a946df0341e20e
SHA512cfd8ae80a4bf3416cdcaf452f9d6afd278aa5871b47aa26646ee95bb241edaf0773ac655c44bf7fe7f3551ce9bd2e8dc431b08d008f76f4bc936fd69d9cfa090
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C:\Users\Admin\AppData\Local\288a16b3-1f3c-48ec-80ff-3a35ec7a4ec6\509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1.exe
Filesize785KB
MD5ed61f850998129a23067242a868a2044
SHA1f5873bdd503ab43cc7c1bf7bfb9294a36bc8b74a
SHA256509466341efb97d03c3ffc43b6e6570941da23566b1d1101fbde8a836047a7b1
SHA512ee3094216838491481fc42cac3bfa518733f95e4765a7348cb43e449d74b7f58818f6fe41a4661907ae0648ef0a219a069231808a0bda6173f7677aeba7e7a41
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Filesize
222KB
MD5cb3caf60d63416b453f082de56510f98
SHA1b06d9d1fd647e7e176d8b88c23be1b59f23ca26e
SHA256d883478d7646dd5f53a6ce22e76b432cf1023fb456d2fe8c90176b96754db9e9
SHA5121cb17bd4b917fdfcd322438c54df7bad6dc82756558fc39e531083ee02977c107de00ce0bce2553962cf2ad6a2f6d5181d5f235cda4457149539f0aa52c361e7
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Filesize
222KB
MD5cb3caf60d63416b453f082de56510f98
SHA1b06d9d1fd647e7e176d8b88c23be1b59f23ca26e
SHA256d883478d7646dd5f53a6ce22e76b432cf1023fb456d2fe8c90176b96754db9e9
SHA5121cb17bd4b917fdfcd322438c54df7bad6dc82756558fc39e531083ee02977c107de00ce0bce2553962cf2ad6a2f6d5181d5f235cda4457149539f0aa52c361e7
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Filesize
222KB
MD5cb3caf60d63416b453f082de56510f98
SHA1b06d9d1fd647e7e176d8b88c23be1b59f23ca26e
SHA256d883478d7646dd5f53a6ce22e76b432cf1023fb456d2fe8c90176b96754db9e9
SHA5121cb17bd4b917fdfcd322438c54df7bad6dc82756558fc39e531083ee02977c107de00ce0bce2553962cf2ad6a2f6d5181d5f235cda4457149539f0aa52c361e7
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Filesize
1KB
MD5cc6901a2665a3928d7547895d62e1bfd
SHA1552303030ba53828fe3cdf725c44e84494f16de5
SHA2561ef93ea88586bd708e6f8fe05622a4d7d481c327a822d9cc795ee6f4f31636d8
SHA5129646389573b831dcdc65cdf83fdb9d7d715140050d55928dfaf3f31e23e2186bdef133c5a009039b80feb36e37d260823409636b5aeeea271dda30ab0e74539f