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Analysis
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max time kernel
67s -
max time network
130s -
platform
windows10-2004_x64 -
resource
win10v2004-20220812-en -
resource tags
arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system -
submitted
16/09/2022, 23:55
Static task
static1
Behavioral task
behavioral1
Sample
file.exe
Resource
win7-20220812-en
Behavioral task
behavioral2
Sample
file.exe
Resource
win10v2004-20220812-en
General
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Target
file.exe
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Size
820KB
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MD5
617ad37350065407d3f385ce460dfc65
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SHA1
0b3083761f3417857f5a0f14d131bf691a32c087
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SHA256
ec12bb53d94b1a84e4715f0b671b87eeaff4360217c6336897622c225499b3b9
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SHA512
460af814aeaef538d0e6b2d67cfff3f53b245da0657d3f73c2797bcd3d2b2f141e7baa5f2d2b2f8d2f560465cd9eed93116158da3aa3b1cdf7dcc36b3c08fd38
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SSDEEP
24576:bifl0zISMgxANgTHMyISKUfOLcHGKQWdvKTji:bs0zx6N5UmgKWV
Malware Config
Extracted
djvu
http://acacaca.org/test3/get.php
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extension
.aamv
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offline_id
MyudhIExJux2oRQXw95TT1oAPu7mvqRMzxr1eet1
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payload_url
http://rgyui.top/dl/build2.exe
http://acacaca.org/files/1/build3.exe
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ransomnote
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Signatures
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Detected Djvu ransomware 10 IoCs
resource yara_rule behavioral2/memory/4696-135-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/5040-136-0x00000000023F0000-0x000000000250B000-memory.dmp family_djvu behavioral2/memory/4696-133-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4696-137-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4696-138-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4696-142-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/3292-145-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/3292-147-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/3292-152-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/3292-169-0x0000000000400000-0x0000000000537000-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 4 IoCs
pid Process 4368 build2.exe 4580 build3.exe 532 build2.exe 1256 mstsca.exe -
Checks computer location settings 2 TTPs 3 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation build2.exe Key value queried \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation file.exe Key value queried \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation file.exe -
Loads dropped DLL 2 IoCs
pid Process 532 build2.exe 532 build2.exe -
Modifies file permissions 1 TTPs 1 IoCs
pid Process 1236 icacls.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
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Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\7e9700be-535a-462c-b3d0-87af5277a2df\\file.exe\" --AutoStart" file.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 22 api.2ip.ua 11 api.2ip.ua 12 api.2ip.ua -
Suspicious use of SetThreadContext 3 IoCs
description pid Process procid_target PID 5040 set thread context of 4696 5040 file.exe 84 PID 4028 set thread context of 3292 4028 file.exe 91 PID 4368 set thread context of 532 4368 build2.exe 96 -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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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 -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 4548 schtasks.exe 4288 schtasks.exe -
Delays execution with timeout.exe 1 IoCs
pid Process 5044 timeout.exe -
Kills process with taskkill 1 IoCs
pid Process 1772 taskkill.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 4696 file.exe 4696 file.exe 3292 file.exe 3292 file.exe 532 build2.exe 532 build2.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 1772 taskkill.exe -
Suspicious use of WriteProcessMemory 56 IoCs
description pid Process procid_target PID 5040 wrote to memory of 4696 5040 file.exe 84 PID 5040 wrote to memory of 4696 5040 file.exe 84 PID 5040 wrote to memory of 4696 5040 file.exe 84 PID 5040 wrote to memory of 4696 5040 file.exe 84 PID 5040 wrote to memory of 4696 5040 file.exe 84 PID 5040 wrote to memory of 4696 5040 file.exe 84 PID 5040 wrote to memory of 4696 5040 file.exe 84 PID 5040 wrote to memory of 4696 5040 file.exe 84 PID 5040 wrote to memory of 4696 5040 file.exe 84 PID 5040 wrote to memory of 4696 5040 file.exe 84 PID 4696 wrote to memory of 1236 4696 file.exe 86 PID 4696 wrote to memory of 1236 4696 file.exe 86 PID 4696 wrote to memory of 1236 4696 file.exe 86 PID 4696 wrote to memory of 4028 4696 file.exe 87 PID 4696 wrote to memory of 4028 4696 file.exe 87 PID 4696 wrote to memory of 4028 4696 file.exe 87 PID 4028 wrote to memory of 3292 4028 file.exe 91 PID 4028 wrote to memory of 3292 4028 file.exe 91 PID 4028 wrote to memory of 3292 4028 file.exe 91 PID 4028 wrote to memory of 3292 4028 file.exe 91 PID 4028 wrote to memory of 3292 4028 file.exe 91 PID 4028 wrote to memory of 3292 4028 file.exe 91 PID 4028 wrote to memory of 3292 4028 file.exe 91 PID 4028 wrote to memory of 3292 4028 file.exe 91 PID 4028 wrote to memory of 3292 4028 file.exe 91 PID 4028 wrote to memory of 3292 4028 file.exe 91 PID 3292 wrote to memory of 4368 3292 file.exe 92 PID 3292 wrote to memory of 4368 3292 file.exe 92 PID 3292 wrote to memory of 4368 3292 file.exe 92 PID 3292 wrote to memory of 4580 3292 file.exe 93 PID 3292 wrote to memory of 4580 3292 file.exe 93 PID 3292 wrote to memory of 4580 3292 file.exe 93 PID 4580 wrote to memory of 4288 4580 build3.exe 94 PID 4580 wrote to memory of 4288 4580 build3.exe 94 PID 4580 wrote to memory of 4288 4580 build3.exe 94 PID 4368 wrote to memory of 532 4368 build2.exe 96 PID 4368 wrote to memory of 532 4368 build2.exe 96 PID 4368 wrote to memory of 532 4368 build2.exe 96 PID 4368 wrote to memory of 532 4368 build2.exe 96 PID 4368 wrote to memory of 532 4368 build2.exe 96 PID 4368 wrote to memory of 532 4368 build2.exe 96 PID 4368 wrote to memory of 532 4368 build2.exe 96 PID 4368 wrote to memory of 532 4368 build2.exe 96 PID 4368 wrote to memory of 532 4368 build2.exe 96 PID 532 wrote to memory of 4184 532 build2.exe 98 PID 532 wrote to memory of 4184 532 build2.exe 98 PID 532 wrote to memory of 4184 532 build2.exe 98 PID 4184 wrote to memory of 1772 4184 cmd.exe 100 PID 4184 wrote to memory of 1772 4184 cmd.exe 100 PID 4184 wrote to memory of 1772 4184 cmd.exe 100 PID 4184 wrote to memory of 5044 4184 cmd.exe 101 PID 4184 wrote to memory of 5044 4184 cmd.exe 101 PID 4184 wrote to memory of 5044 4184 cmd.exe 101 PID 1256 wrote to memory of 4548 1256 mstsca.exe 103 PID 1256 wrote to memory of 4548 1256 mstsca.exe 103 PID 1256 wrote to memory of 4548 1256 mstsca.exe 103
Processes
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:5040 -
C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"2⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4696 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\7e9700be-535a-462c-b3d0-87af5277a2df" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:1236
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4028 -
C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3292 -
C:\Users\Admin\AppData\Local\8cdcde07-2b5b-4e62-887c-34f35a3c123f\build2.exe"C:\Users\Admin\AppData\Local\8cdcde07-2b5b-4e62-887c-34f35a3c123f\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4368 -
C:\Users\Admin\AppData\Local\8cdcde07-2b5b-4e62-887c-34f35a3c123f\build2.exe"C:\Users\Admin\AppData\Local\8cdcde07-2b5b-4e62-887c-34f35a3c123f\build2.exe"6⤵
- Executes dropped EXE
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:532 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" И/c taskkill /im build2.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\8cdcde07-2b5b-4e62-887c-34f35a3c123f\build2.exe" & del C:\PrograData\*.dll & exit7⤵
- Suspicious use of WriteProcessMemory
PID:4184 -
C:\Windows\SysWOW64\taskkill.exetaskkill /im build2.exe /f8⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1772
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C:\Windows\SysWOW64\timeout.exetimeout /t 68⤵
- Delays execution with timeout.exe
PID:5044
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C:\Users\Admin\AppData\Local\8cdcde07-2b5b-4e62-887c-34f35a3c123f\build3.exe"C:\Users\Admin\AppData\Local\8cdcde07-2b5b-4e62-887c-34f35a3c123f\build3.exe"5⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:4580 -
C:\Windows\SysWOW64\schtasks.exe/C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"6⤵
- Creates scheduled task(s)
PID:4288
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C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exeC:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe1⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:1256 -
C:\Windows\SysWOW64\schtasks.exe/C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"2⤵
- Creates scheduled task(s)
PID:4548
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
593KB
MD5c8fd9be83bc728cc04beffafc2907fe9
SHA195ab9f701e0024cedfbd312bcfe4e726744c4f2e
SHA256ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a
SHA512fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040
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Filesize
2.0MB
MD51cc453cdf74f31e4d913ff9c10acdde2
SHA16e85eae544d6e965f15fa5c39700fa7202f3aafe
SHA256ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5
SHA512dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
Filesize2KB
MD5ea3ead1b160922fb25b1b9d766a56fa5
SHA19f61cb0a5a80fa5ba776f71fed4728d002d3aca1
SHA2564080213fba647d43c0ac02710ac7b631c23f8f791930016045cda9aeec1b6867
SHA512ec817bdc668bff4c266ca8b6a6c4068251926714262a95f9ac7f7565e2d66a26371589182d0ba1d03fa482d99430b865cb7eb24becf92b72e45f20b26a215c15
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
Filesize1KB
MD5e9e482bf825221326b7c080ef52e5036
SHA167244c170dad567630298f89364a5e9626e2517a
SHA25660843d5086f10e833ca98696967f1a39ea04a2ffee6d87679b5803092b9cfa71
SHA512c7a5fd63c0faa2a5cd8be90c7dcf10d8dd564964dc4b8ab4fa1a7a188fa89094563f595c94f4ea133582cfbcf9cc90cb74bd273924b7fa5eadae868bced51440
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
Filesize488B
MD5b3bdabadc841e779cb5931215b1191a2
SHA1b23148102badb05a2daf8ddf50dedc3237ddb7e5
SHA256e54c4cf1d8d1bd760a184cb42d6c0e42ecbaaec7d70d2fc6392d9a3f3aa8260a
SHA512e428a70a145e9433e5620f227995e435514381e6cac6c95a25b9f5bb2290c5dfdc4cbcafe5ed12bf1f49a1b541838a21c792c0cf282f56a5d631275b5d7b6387
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
Filesize482B
MD5d1283f22b2a519bd0b6c12a7bff640a3
SHA17281ffe1bdac836fbc4433bb09f6dae32a9c3dd6
SHA2568d29f975984900b149bd76213162918d19c54f115b1f0a46203ce1bc92c9f59c
SHA512cdaa26d574facab66b41bdd538e0445080460d5836aa9e260acab59ec6e89cd9826d174d47d8a528b328d2521ddcbf55c7c7258c45e45895a3d626a6a7a90008
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Filesize
820KB
MD5617ad37350065407d3f385ce460dfc65
SHA10b3083761f3417857f5a0f14d131bf691a32c087
SHA256ec12bb53d94b1a84e4715f0b671b87eeaff4360217c6336897622c225499b3b9
SHA512460af814aeaef538d0e6b2d67cfff3f53b245da0657d3f73c2797bcd3d2b2f141e7baa5f2d2b2f8d2f560465cd9eed93116158da3aa3b1cdf7dcc36b3c08fd38
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Filesize
376KB
MD58b01bb02b7aeb097ba96dc7628575ca0
SHA111046fb024f695b1dc7a3a0be9167cb4e85548c6
SHA2567abb4b2423a93fa4b7a2cd19bcc854cc96d2e9ed20c13b86c39f49fe7cb80e4a
SHA51264cd772d4e319255e32909577ac137966cd47bd295aa3a61a76e52d651d80d313a3cfee7ea88d703bb293931a91558161184de2b76f8e5d9a2358a065c5c5f35
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Filesize
376KB
MD58b01bb02b7aeb097ba96dc7628575ca0
SHA111046fb024f695b1dc7a3a0be9167cb4e85548c6
SHA2567abb4b2423a93fa4b7a2cd19bcc854cc96d2e9ed20c13b86c39f49fe7cb80e4a
SHA51264cd772d4e319255e32909577ac137966cd47bd295aa3a61a76e52d651d80d313a3cfee7ea88d703bb293931a91558161184de2b76f8e5d9a2358a065c5c5f35
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Filesize
376KB
MD58b01bb02b7aeb097ba96dc7628575ca0
SHA111046fb024f695b1dc7a3a0be9167cb4e85548c6
SHA2567abb4b2423a93fa4b7a2cd19bcc854cc96d2e9ed20c13b86c39f49fe7cb80e4a
SHA51264cd772d4e319255e32909577ac137966cd47bd295aa3a61a76e52d651d80d313a3cfee7ea88d703bb293931a91558161184de2b76f8e5d9a2358a065c5c5f35
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Filesize
9KB
MD59ead10c08e72ae41921191f8db39bc16
SHA1abe3bce01cd34afc88e2c838173f8c2bd0090ae1
SHA2568d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
SHA512aa35dbc59a3589df2763e76a495ce5a9e62196628b4c1d098add38bd7f27c49edf93a66fb8507fb746e37ee32932da2460e440f241abe1a5a279abcc1e5ffe4a
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Filesize
9KB
MD59ead10c08e72ae41921191f8db39bc16
SHA1abe3bce01cd34afc88e2c838173f8c2bd0090ae1
SHA2568d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
SHA512aa35dbc59a3589df2763e76a495ce5a9e62196628b4c1d098add38bd7f27c49edf93a66fb8507fb746e37ee32932da2460e440f241abe1a5a279abcc1e5ffe4a
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Filesize
9KB
MD59ead10c08e72ae41921191f8db39bc16
SHA1abe3bce01cd34afc88e2c838173f8c2bd0090ae1
SHA2568d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
SHA512aa35dbc59a3589df2763e76a495ce5a9e62196628b4c1d098add38bd7f27c49edf93a66fb8507fb746e37ee32932da2460e440f241abe1a5a279abcc1e5ffe4a
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Filesize
9KB
MD59ead10c08e72ae41921191f8db39bc16
SHA1abe3bce01cd34afc88e2c838173f8c2bd0090ae1
SHA2568d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
SHA512aa35dbc59a3589df2763e76a495ce5a9e62196628b4c1d098add38bd7f27c49edf93a66fb8507fb746e37ee32932da2460e440f241abe1a5a279abcc1e5ffe4a