Analysis
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max time kernel
98s -
max time network
184s -
platform
windows10-1703_x64 -
resource
win10-20220812-en -
resource tags
arch:x64arch:x86image:win10-20220812-enlocale:en-usos:windows10-1703-x64system -
submitted
20/09/2022, 14:11
Static task
static1
Behavioral task
behavioral1
Sample
7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe
Resource
win7-20220812-en
Behavioral task
behavioral2
Sample
7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe
Resource
win10-20220812-en
General
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Target
7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe
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Size
724KB
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MD5
bb9c07e6dc9516068dd084a47af0e171
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SHA1
9d46e57c48f45f87ec6aaef0e94ab30f036d047a
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SHA256
7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2
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SHA512
87453e24eb9f86c97461d045dccf2e2f8a71e0795b40683c9ed07f5b0ec0603b5a05ee44d6bac713c03ec9a2f1556ff06b6199b0fb532c9f803d9249d1e6f582
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SSDEEP
12288:LPrzhiPxgm52P6SXDSOEc1m/MqCl2mtklvJv35XEfsmh5Rm65j0:LPRiJgk2P6SX2OEcIE3l20AvJv3FEzhe
Malware Config
Extracted
djvu
http://acacaca.org/test1/get.php
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extension
.mmpu
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offline_id
yd6oYv6aBN90yFzTWdZ34sXSXtXiauzOLXZyWht1
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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 8 IoCs
resource yara_rule behavioral2/memory/2432-144-0x0000000004B40000-0x0000000004C5B000-memory.dmp family_djvu behavioral2/memory/2592-147-0x0000000000424141-mapping.dmp family_djvu behavioral2/memory/2592-146-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2592-153-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2592-214-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2592-246-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4008-273-0x0000000000424141-mapping.dmp family_djvu behavioral2/memory/4008-332-0x0000000000400000-0x0000000000537000-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 4520 build2.exe 3264 build2.exe 2188 build3.exe 4104 mstsca.exe -
Loads dropped DLL 2 IoCs
pid Process 3264 build2.exe 3264 build2.exe -
Modifies file permissions 1 TTPs 1 IoCs
pid Process 3508 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-1-5-21-1099808672-3828198950-1535142148-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\ef634008-d7a8-4a0f-b88b-b6ad0940a1d4\\7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe\" --AutoStart" 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.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 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 2 api.2ip.ua 3 api.2ip.ua -
Suspicious use of SetThreadContext 3 IoCs
description pid Process procid_target PID 2432 set thread context of 2592 2432 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 66 PID 4280 set thread context of 4008 4280 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 70 PID 4520 set thread context of 3264 4520 build2.exe 72 -
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 2152 schtasks.exe 3276 schtasks.exe -
Delays execution with timeout.exe 1 IoCs
pid Process 4464 timeout.exe -
Kills process with taskkill 1 IoCs
pid Process 5060 taskkill.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 2592 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 2592 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 4008 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 4008 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 3264 build2.exe 3264 build2.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 5060 taskkill.exe -
Suspicious use of WriteProcessMemory 56 IoCs
description pid Process procid_target PID 2432 wrote to memory of 2592 2432 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 66 PID 2432 wrote to memory of 2592 2432 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 66 PID 2432 wrote to memory of 2592 2432 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 66 PID 2432 wrote to memory of 2592 2432 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 66 PID 2432 wrote to memory of 2592 2432 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 66 PID 2432 wrote to memory of 2592 2432 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 66 PID 2432 wrote to memory of 2592 2432 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 66 PID 2432 wrote to memory of 2592 2432 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 66 PID 2432 wrote to memory of 2592 2432 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 66 PID 2432 wrote to memory of 2592 2432 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 66 PID 2592 wrote to memory of 3508 2592 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 67 PID 2592 wrote to memory of 3508 2592 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 67 PID 2592 wrote to memory of 3508 2592 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 67 PID 2592 wrote to memory of 4280 2592 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 68 PID 2592 wrote to memory of 4280 2592 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 68 PID 2592 wrote to memory of 4280 2592 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 68 PID 4280 wrote to memory of 4008 4280 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 70 PID 4280 wrote to memory of 4008 4280 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 70 PID 4280 wrote to memory of 4008 4280 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 70 PID 4280 wrote to memory of 4008 4280 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 70 PID 4280 wrote to memory of 4008 4280 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 70 PID 4280 wrote to memory of 4008 4280 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 70 PID 4280 wrote to memory of 4008 4280 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 70 PID 4280 wrote to memory of 4008 4280 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 70 PID 4280 wrote to memory of 4008 4280 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 70 PID 4280 wrote to memory of 4008 4280 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 70 PID 4008 wrote to memory of 4520 4008 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 71 PID 4008 wrote to memory of 4520 4008 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 71 PID 4008 wrote to memory of 4520 4008 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 71 PID 4520 wrote to memory of 3264 4520 build2.exe 72 PID 4520 wrote to memory of 3264 4520 build2.exe 72 PID 4520 wrote to memory of 3264 4520 build2.exe 72 PID 4520 wrote to memory of 3264 4520 build2.exe 72 PID 4520 wrote to memory of 3264 4520 build2.exe 72 PID 4520 wrote to memory of 3264 4520 build2.exe 72 PID 4520 wrote to memory of 3264 4520 build2.exe 72 PID 4520 wrote to memory of 3264 4520 build2.exe 72 PID 4520 wrote to memory of 3264 4520 build2.exe 72 PID 4008 wrote to memory of 2188 4008 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 73 PID 4008 wrote to memory of 2188 4008 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 73 PID 4008 wrote to memory of 2188 4008 7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe 73 PID 2188 wrote to memory of 2152 2188 build3.exe 74 PID 2188 wrote to memory of 2152 2188 build3.exe 74 PID 2188 wrote to memory of 2152 2188 build3.exe 74 PID 3264 wrote to memory of 2120 3264 build2.exe 76 PID 3264 wrote to memory of 2120 3264 build2.exe 76 PID 3264 wrote to memory of 2120 3264 build2.exe 76 PID 2120 wrote to memory of 5060 2120 cmd.exe 78 PID 2120 wrote to memory of 5060 2120 cmd.exe 78 PID 2120 wrote to memory of 5060 2120 cmd.exe 78 PID 2120 wrote to memory of 4464 2120 cmd.exe 80 PID 2120 wrote to memory of 4464 2120 cmd.exe 80 PID 2120 wrote to memory of 4464 2120 cmd.exe 80 PID 4104 wrote to memory of 3276 4104 mstsca.exe 82 PID 4104 wrote to memory of 3276 4104 mstsca.exe 82 PID 4104 wrote to memory of 3276 4104 mstsca.exe 82
Processes
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C:\Users\Admin\AppData\Local\Temp\7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe"C:\Users\Admin\AppData\Local\Temp\7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2432 -
C:\Users\Admin\AppData\Local\Temp\7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe"C:\Users\Admin\AppData\Local\Temp\7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe"2⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2592 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\ef634008-d7a8-4a0f-b88b-b6ad0940a1d4" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:3508
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C:\Users\Admin\AppData\Local\Temp\7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe"C:\Users\Admin\AppData\Local\Temp\7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4280 -
C:\Users\Admin\AppData\Local\Temp\7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe"C:\Users\Admin\AppData\Local\Temp\7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4008 -
C:\Users\Admin\AppData\Local\7e241bf2-d969-4ad0-b74e-8f22c07d3506\build2.exe"C:\Users\Admin\AppData\Local\7e241bf2-d969-4ad0-b74e-8f22c07d3506\build2.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4520 -
C:\Users\Admin\AppData\Local\7e241bf2-d969-4ad0-b74e-8f22c07d3506\build2.exe"C:\Users\Admin\AppData\Local\7e241bf2-d969-4ad0-b74e-8f22c07d3506\build2.exe"6⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3264 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" ƒœX¶i/c taskkill /im build2.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\7e241bf2-d969-4ad0-b74e-8f22c07d3506\build2.exe" & del C:\PrograData\*.dll & exit7⤵
- Suspicious use of WriteProcessMemory
PID:2120 -
C:\Windows\SysWOW64\taskkill.exetaskkill /im build2.exe /f8⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:5060
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C:\Windows\SysWOW64\timeout.exetimeout /t 68⤵
- Delays execution with timeout.exe
PID:4464
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C:\Users\Admin\AppData\Local\7e241bf2-d969-4ad0-b74e-8f22c07d3506\build3.exe"C:\Users\Admin\AppData\Local\7e241bf2-d969-4ad0-b74e-8f22c07d3506\build3.exe"5⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:2188 -
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:2152
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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:4104 -
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:3276
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
246KB
MD54e08ecaa075b90f30327bf200d23130b
SHA1f7b67a7abbe3815bd758933f7c4712bd4d4ec4b2
SHA2566c11af0bbd346329224255d38a07fb9db5828881d3520ab4623c7a5fc09ecd47
SHA512e7deeafe000b034cd4d71776cd1285e33d295a830f3459506dd7332e8c1c61b43ec2fdc406c22ba5262aa62a795421492f7e54602bfe08102b8b2a000d150bb7
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Filesize
246KB
MD54e08ecaa075b90f30327bf200d23130b
SHA1f7b67a7abbe3815bd758933f7c4712bd4d4ec4b2
SHA2566c11af0bbd346329224255d38a07fb9db5828881d3520ab4623c7a5fc09ecd47
SHA512e7deeafe000b034cd4d71776cd1285e33d295a830f3459506dd7332e8c1c61b43ec2fdc406c22ba5262aa62a795421492f7e54602bfe08102b8b2a000d150bb7
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Filesize
246KB
MD54e08ecaa075b90f30327bf200d23130b
SHA1f7b67a7abbe3815bd758933f7c4712bd4d4ec4b2
SHA2566c11af0bbd346329224255d38a07fb9db5828881d3520ab4623c7a5fc09ecd47
SHA512e7deeafe000b034cd4d71776cd1285e33d295a830f3459506dd7332e8c1c61b43ec2fdc406c22ba5262aa62a795421492f7e54602bfe08102b8b2a000d150bb7
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Filesize
9KB
MD59ead10c08e72ae41921191f8db39bc16
SHA1abe3bce01cd34afc88e2c838173f8c2bd0090ae1
SHA2568d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
SHA512aa35dbc59a3589df2763e76a495ce5a9e62196628b4c1d098add38bd7f27c49edf93a66fb8507fb746e37ee32932da2460e440f241abe1a5a279abcc1e5ffe4a
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Filesize
9KB
MD59ead10c08e72ae41921191f8db39bc16
SHA1abe3bce01cd34afc88e2c838173f8c2bd0090ae1
SHA2568d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
SHA512aa35dbc59a3589df2763e76a495ce5a9e62196628b4c1d098add38bd7f27c49edf93a66fb8507fb746e37ee32932da2460e440f241abe1a5a279abcc1e5ffe4a
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C:\Users\Admin\AppData\Local\ef634008-d7a8-4a0f-b88b-b6ad0940a1d4\7cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2.exe
Filesize724KB
MD5bb9c07e6dc9516068dd084a47af0e171
SHA19d46e57c48f45f87ec6aaef0e94ab30f036d047a
SHA2567cd3b1683146bfd22685a44a18041c8d96af6c23c13563831f13bfb92dd4f6e2
SHA51287453e24eb9f86c97461d045dccf2e2f8a71e0795b40683c9ed07f5b0ec0603b5a05ee44d6bac713c03ec9a2f1556ff06b6199b0fb532c9f803d9249d1e6f582
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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
593KB
MD5c8fd9be83bc728cc04beffafc2907fe9
SHA195ab9f701e0024cedfbd312bcfe4e726744c4f2e
SHA256ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a
SHA512fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040
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Filesize
2.0MB
MD51cc453cdf74f31e4d913ff9c10acdde2
SHA16e85eae544d6e965f15fa5c39700fa7202f3aafe
SHA256ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5
SHA512dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571