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Analysis
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max time kernel
96s -
max time network
129s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
21/12/2024, 16:23
Static task
static1
Behavioral task
behavioral1
Sample
sample.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
sample.exe
Resource
win10v2004-20241007-en
General
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Target
sample.exe
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Size
775KB
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MD5
b318b2664abf0d93433255643aaae35c
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SHA1
9f8748a0459a6cef1a67c3b44c21f3eaa8e360f0
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SHA256
4fbf13052ed4c7f12cda197e43998550d4b698d53ca08616929dbded612726c2
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SHA512
f6dffa75f2caf6a57130e911461626adefa5301ef02ad00f9d606c155c983971c9b49e6905ed063c3becaf331aad2d694a68a7302316a33937c8f75592ff869f
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SSDEEP
12288:uqyWSUBQv0EroDgRgp4LPTskElzS9zad8HT/AB+c9X+oeJzYf94SRZj1LJ+H:uqNQv0XDegs2SpSI0X+oB4SRZjxgH
Malware Config
Extracted
djvu
http://fuyt.org/fhsgtsspen6/get.php
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extension
.uyjh
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offline_id
LgcOIftV0dQfFBQStVNfb8BhHy8tHRPvXwSiFwt1
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payload_url
http://zerit.top/dl/build2.exe
http://fuyt.org/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 behavioral2/memory/2816-2-0x0000000002380000-0x000000000249B000-memory.dmp family_djvu behavioral2/memory/4840-3-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4840-4-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4840-5-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4840-6-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/4840-19-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2416-24-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2416-26-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu behavioral2/memory/2416-23-0x0000000000400000-0x0000000000537000-memory.dmp family_djvu -
Djvu Ransomware
Ransomware which is a variant of the STOP family.
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Djvu 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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation sample.exe -
Modifies file permissions 1 TTPs 1 IoCs
pid Process 2808 icacls.exe -
Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\8aa1d9c2-e23d-442a-ab6f-4a1b4ca4264f\\sample.exe\" --AutoStart" sample.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 6 api.2ip.ua 7 api.2ip.ua -
Suspicious use of SetThreadContext 2 IoCs
description pid Process procid_target PID 2816 set thread context of 4840 2816 sample.exe 83 PID 2832 set thread context of 2416 2832 sample.exe 88 -
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 2444 2416 WerFault.exe 88 -
System Location Discovery: System Language Discovery 1 TTPs 5 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language sample.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language sample.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language sample.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language sample.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language icacls.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 4840 sample.exe 4840 sample.exe -
Suspicious use of WriteProcessMemory 26 IoCs
description pid Process procid_target PID 2816 wrote to memory of 4840 2816 sample.exe 83 PID 2816 wrote to memory of 4840 2816 sample.exe 83 PID 2816 wrote to memory of 4840 2816 sample.exe 83 PID 2816 wrote to memory of 4840 2816 sample.exe 83 PID 2816 wrote to memory of 4840 2816 sample.exe 83 PID 2816 wrote to memory of 4840 2816 sample.exe 83 PID 2816 wrote to memory of 4840 2816 sample.exe 83 PID 2816 wrote to memory of 4840 2816 sample.exe 83 PID 2816 wrote to memory of 4840 2816 sample.exe 83 PID 2816 wrote to memory of 4840 2816 sample.exe 83 PID 4840 wrote to memory of 2808 4840 sample.exe 84 PID 4840 wrote to memory of 2808 4840 sample.exe 84 PID 4840 wrote to memory of 2808 4840 sample.exe 84 PID 4840 wrote to memory of 2832 4840 sample.exe 85 PID 4840 wrote to memory of 2832 4840 sample.exe 85 PID 4840 wrote to memory of 2832 4840 sample.exe 85 PID 2832 wrote to memory of 2416 2832 sample.exe 88 PID 2832 wrote to memory of 2416 2832 sample.exe 88 PID 2832 wrote to memory of 2416 2832 sample.exe 88 PID 2832 wrote to memory of 2416 2832 sample.exe 88 PID 2832 wrote to memory of 2416 2832 sample.exe 88 PID 2832 wrote to memory of 2416 2832 sample.exe 88 PID 2832 wrote to memory of 2416 2832 sample.exe 88 PID 2832 wrote to memory of 2416 2832 sample.exe 88 PID 2832 wrote to memory of 2416 2832 sample.exe 88 PID 2832 wrote to memory of 2416 2832 sample.exe 88
Processes
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C:\Users\Admin\AppData\Local\Temp\sample.exe"C:\Users\Admin\AppData\Local\Temp\sample.exe"1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2816 -
C:\Users\Admin\AppData\Local\Temp\sample.exe"C:\Users\Admin\AppData\Local\Temp\sample.exe"2⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4840 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\8aa1d9c2-e23d-442a-ab6f-4a1b4ca4264f" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
- System Location Discovery: System Language Discovery
PID:2808
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C:\Users\Admin\AppData\Local\Temp\sample.exe"C:\Users\Admin\AppData\Local\Temp\sample.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2832 -
C:\Users\Admin\AppData\Local\Temp\sample.exe"C:\Users\Admin\AppData\Local\Temp\sample.exe" --Admin IsNotAutoStart IsNotTask4⤵
- System Location Discovery: System Language Discovery
PID:2416 -
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 2416 -s 5845⤵
- Program crash
PID:2444
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2416 -ip 24161⤵PID:3556
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
775KB
MD5b318b2664abf0d93433255643aaae35c
SHA19f8748a0459a6cef1a67c3b44c21f3eaa8e360f0
SHA2564fbf13052ed4c7f12cda197e43998550d4b698d53ca08616929dbded612726c2
SHA512f6dffa75f2caf6a57130e911461626adefa5301ef02ad00f9d606c155c983971c9b49e6905ed063c3becaf331aad2d694a68a7302316a33937c8f75592ff869f