Analysis
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max time kernel
90s -
max time network
116s -
platform
windows10-2004_x64 -
resource
win10v2004-20240412-en -
resource tags
arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system -
submitted
15/04/2024, 23:27
Static task
static1
Behavioral task
behavioral1
Sample
50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe
Resource
win10v2004-20240412-en
Behavioral task
behavioral2
Sample
50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe
Resource
win11-20240412-en
General
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Target
50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe
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Size
860KB
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MD5
7bf2ed31e5b9c59d24f750dbbcf10ab5
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SHA1
1ff4a18a6d8ec058be1896dc90757f42e60c588b
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SHA256
50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496
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SHA512
88ef1d7c63190df6e832dbb71f1790911e5f0b41c492de124f605d4a261e7c8b7a4519e23fc6d8abc9db642940431c97a622e6a7b6f71d7086644a1c7525c04d
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SSDEEP
12288:aPeK5kzr8+6omE6wZGkJWGcowKFUXqtDvGBf+MpMMFUMxO38/njdk4:aPQN6jPZK2qgf+MtFURGnjh
Malware Config
Extracted
djvu
http://sajdfue.com/test1/get.php
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extension
.uajs
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offline_id
Jx0i3k2ogR5cKxX1evmz0Ex7TUxOUlnbh2dvnIt1
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payload_url
http://sdfjhuz.com/dl/build2.exe
http://sajdfue.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/2768-2-0x0000000004BD0000-0x0000000004CEB000-memory.dmp family_djvu behavioral1/memory/1520-3-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/1520-4-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/1520-5-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/1520-6-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/1520-19-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/1812-24-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/1812-25-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral1/memory/1812-27-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu -
Djvu Ransomware
Ransomware which is a variant of the STOP family.
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Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-259785868-298165991-4178590326-1000\Control Panel\International\Geo\Nation 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe -
Modifies file permissions 1 TTPs 1 IoCs
pid Process 1248 icacls.exe -
Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-259785868-298165991-4178590326-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\0ca49812-f7b2-4447-bc93-fa6adac3949e\\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe\" --AutoStart" 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.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 4 api.2ip.ua 7 api.2ip.ua -
Suspicious use of SetThreadContext 2 IoCs
description pid Process procid_target PID 2768 set thread context of 1520 2768 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 91 PID 4648 set thread context of 1812 4648 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 95 -
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 2700 1812 WerFault.exe 95 -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 1520 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 1520 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe -
Suspicious use of WriteProcessMemory 26 IoCs
description pid Process procid_target PID 2768 wrote to memory of 1520 2768 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 91 PID 2768 wrote to memory of 1520 2768 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 91 PID 2768 wrote to memory of 1520 2768 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 91 PID 2768 wrote to memory of 1520 2768 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 91 PID 2768 wrote to memory of 1520 2768 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 91 PID 2768 wrote to memory of 1520 2768 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 91 PID 2768 wrote to memory of 1520 2768 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 91 PID 2768 wrote to memory of 1520 2768 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 91 PID 2768 wrote to memory of 1520 2768 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 91 PID 2768 wrote to memory of 1520 2768 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 91 PID 1520 wrote to memory of 1248 1520 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 92 PID 1520 wrote to memory of 1248 1520 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 92 PID 1520 wrote to memory of 1248 1520 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 92 PID 1520 wrote to memory of 4648 1520 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 93 PID 1520 wrote to memory of 4648 1520 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 93 PID 1520 wrote to memory of 4648 1520 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 93 PID 4648 wrote to memory of 1812 4648 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 95 PID 4648 wrote to memory of 1812 4648 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 95 PID 4648 wrote to memory of 1812 4648 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 95 PID 4648 wrote to memory of 1812 4648 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 95 PID 4648 wrote to memory of 1812 4648 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 95 PID 4648 wrote to memory of 1812 4648 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 95 PID 4648 wrote to memory of 1812 4648 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 95 PID 4648 wrote to memory of 1812 4648 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 95 PID 4648 wrote to memory of 1812 4648 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 95 PID 4648 wrote to memory of 1812 4648 50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe 95
Processes
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C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe"C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2768 -
C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe"C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe"2⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1520 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\0ca49812-f7b2-4447-bc93-fa6adac3949e" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:1248
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C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe"C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4648 -
C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe"C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe" --Admin IsNotAutoStart IsNotTask4⤵PID:1812
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 5685⤵
- Program crash
PID:2700
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 1812 -ip 18121⤵PID:4064
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\0ca49812-f7b2-4447-bc93-fa6adac3949e\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe
Filesize860KB
MD57bf2ed31e5b9c59d24f750dbbcf10ab5
SHA11ff4a18a6d8ec058be1896dc90757f42e60c588b
SHA25650979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496
SHA51288ef1d7c63190df6e832dbb71f1790911e5f0b41c492de124f605d4a261e7c8b7a4519e23fc6d8abc9db642940431c97a622e6a7b6f71d7086644a1c7525c04d