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Analysis
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max time kernel
127s -
max time network
138s -
platform
windows10-2004_x64 -
resource
win10v2004-20230703-en -
resource tags
arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system -
submitted
24/08/2023, 19:16
Static task
static1
Behavioral task
behavioral1
Sample
841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe
Resource
win10v2004-20230703-en
General
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Target
841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe
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Size
762KB
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MD5
2e1c250639a956a9790f28e8208de685
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SHA1
cc7d4e2d6a74b2431b6e53b876f055367d2737f0
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SHA256
841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87
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SHA512
3ffed2880b73215d53e5f09bf8b277e47dd9e677bde5c8861b7a23c080b5fca5903303f87c75d1de446ddc4f407a00ac994c95745ed774d2d8fab4f0d04ad7d6
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SSDEEP
12288:ZxbDQE4JyP20DdHEiJJY8mqgdMBQF7wlw3LQCnweAlcuac5hKgkalGlB:ZNQ1o20DtrYyex6uuBkPb
Malware Config
Extracted
djvu
http://zexeq.com/test1/get.php
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extension
.wzqw
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offline_id
pGPY4MKNHaEeN9pLKNW37rI0mblzUZFtPsjZ8Ht1
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payload_url
http://colisumy.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 9 IoCs
resource yara_rule behavioral1/memory/2596-2-0x0000000004040000-0x000000000415B000-memory.dmp family_djvu behavioral1/memory/840-3-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/840-4-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/840-5-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/840-6-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/840-17-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4740-22-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4740-23-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/4740-25-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu -
Djvu Ransomware
Ransomware which is a variant of the STOP family.
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Modifies file permissions 1 TTPs 1 IoCs
pid Process 3752 icacls.exe -
Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1722984668-1829624581-3022101259-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\0248591c-6c31-4add-970e-90dbd14d3e0a\\841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe\" --AutoStart" 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe -
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 3 api.2ip.ua 4 api.2ip.ua -
Suspicious use of SetThreadContext 2 IoCs
description pid Process procid_target PID 2596 set thread context of 840 2596 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 82 PID 4864 set thread context of 4740 4864 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 86 -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Program crash 1 IoCs
pid pid_target Process procid_target 1292 4740 WerFault.exe 86 -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 840 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 840 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe -
Suspicious use of WriteProcessMemory 26 IoCs
description pid Process procid_target PID 2596 wrote to memory of 840 2596 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 82 PID 2596 wrote to memory of 840 2596 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 82 PID 2596 wrote to memory of 840 2596 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 82 PID 2596 wrote to memory of 840 2596 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 82 PID 2596 wrote to memory of 840 2596 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 82 PID 2596 wrote to memory of 840 2596 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 82 PID 2596 wrote to memory of 840 2596 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 82 PID 2596 wrote to memory of 840 2596 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 82 PID 2596 wrote to memory of 840 2596 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 82 PID 2596 wrote to memory of 840 2596 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 82 PID 840 wrote to memory of 3752 840 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 83 PID 840 wrote to memory of 3752 840 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 83 PID 840 wrote to memory of 3752 840 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 83 PID 840 wrote to memory of 4864 840 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 84 PID 840 wrote to memory of 4864 840 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 84 PID 840 wrote to memory of 4864 840 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 84 PID 4864 wrote to memory of 4740 4864 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 86 PID 4864 wrote to memory of 4740 4864 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 86 PID 4864 wrote to memory of 4740 4864 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 86 PID 4864 wrote to memory of 4740 4864 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 86 PID 4864 wrote to memory of 4740 4864 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 86 PID 4864 wrote to memory of 4740 4864 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 86 PID 4864 wrote to memory of 4740 4864 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 86 PID 4864 wrote to memory of 4740 4864 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 86 PID 4864 wrote to memory of 4740 4864 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 86 PID 4864 wrote to memory of 4740 4864 841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe 86
Processes
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C:\Users\Admin\AppData\Local\Temp\841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe"C:\Users\Admin\AppData\Local\Temp\841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2596 -
C:\Users\Admin\AppData\Local\Temp\841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe"C:\Users\Admin\AppData\Local\Temp\841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe"2⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:840 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\0248591c-6c31-4add-970e-90dbd14d3e0a" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:3752
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C:\Users\Admin\AppData\Local\Temp\841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe"C:\Users\Admin\AppData\Local\Temp\841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4864 -
C:\Users\Admin\AppData\Local\Temp\841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe"C:\Users\Admin\AppData\Local\Temp\841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe" --Admin IsNotAutoStart IsNotTask4⤵PID:4740
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 4740 -s 5685⤵
- Program crash
PID:1292
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4740 -ip 47401⤵PID:2260
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\0248591c-6c31-4add-970e-90dbd14d3e0a\841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87.exe
Filesize762KB
MD52e1c250639a956a9790f28e8208de685
SHA1cc7d4e2d6a74b2431b6e53b876f055367d2737f0
SHA256841b3295de24b0586adad6161f7a4249809cb0efc4542334c819dcad2a2a1b87
SHA5123ffed2880b73215d53e5f09bf8b277e47dd9e677bde5c8861b7a23c080b5fca5903303f87c75d1de446ddc4f407a00ac994c95745ed774d2d8fab4f0d04ad7d6