djvu | fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5

Analysis

max time kernel
142s
max time network
138s
platform
windows7_x64
resource
win7-en-20210920
submitted
29/09/2021, 07:50

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General

Target
fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe
Size 693KB
Sample210929-jpac9sebc9
SHA256 fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5
MD5 1f8c099a24f7397ff6893bcd5b06919c
SHA1 4f7fa55fab58739bbadc3455178fbc7384677b6f
SHA512 f5f4eefd3b6ed8eb5bed28313ddec924c1f0f2aa4413b490338a5169a69b59ca68f0e8f1e4410b3fa556860056b31739c2c412c7dc780d81e186ca446f4572bc
MD5 SHA1 SHA512

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Signatures

Detected Djvu ransomware 6 IoCs

resource	yara_rule
behavioral1/memory/1144-53-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1144-54-0x0000000000424141-mapping.dmp	family_djvu
behavioral1/memory/1128-56-0x0000000000540000-0x000000000065B000-memory.dmp	family_djvu
behavioral1/memory/1144-57-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/564-62-0x0000000000424141-mapping.dmp	family_djvu
behavioral1/memory/564-64-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

Djvu Ransomware
Ransomware which is a variant of the STOP family.
ransomware djvu

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
800	icacls.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3456797065-1076791440-4146276586-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\3d724c8e-124f-443a-ad30-e024fb7ed4b4\\fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe\" --AutoStart"	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
3	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1128 set thread context of 1144	1128	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	27
PID 1264 set thread context of 564	1264	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	32

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1144	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe
1144	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe
564	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe
564	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1128 wrote to memory of 1144	1128	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	27
PID 1128 wrote to memory of 1144	1128	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	27
PID 1128 wrote to memory of 1144	1128	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	27
PID 1128 wrote to memory of 1144	1128	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	27
PID 1128 wrote to memory of 1144	1128	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	27
PID 1128 wrote to memory of 1144	1128	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	27
PID 1128 wrote to memory of 1144	1128	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	27
PID 1128 wrote to memory of 1144	1128	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	27
PID 1128 wrote to memory of 1144	1128	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	27
PID 1128 wrote to memory of 1144	1128	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	27
PID 1128 wrote to memory of 1144	1128	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	27
PID 1144 wrote to memory of 800	1144	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	30
PID 1144 wrote to memory of 800	1144	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	30
PID 1144 wrote to memory of 800	1144	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	30
PID 1144 wrote to memory of 800	1144	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	30
PID 1144 wrote to memory of 1264	1144	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	31
PID 1144 wrote to memory of 1264	1144	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	31
PID 1144 wrote to memory of 1264	1144	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	31
PID 1144 wrote to memory of 1264	1144	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	31
PID 1264 wrote to memory of 564	1264	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	32
PID 1264 wrote to memory of 564	1264	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	32
PID 1264 wrote to memory of 564	1264	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	32
PID 1264 wrote to memory of 564	1264	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	32
PID 1264 wrote to memory of 564	1264	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	32
PID 1264 wrote to memory of 564	1264	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	32
PID 1264 wrote to memory of 564	1264	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	32
PID 1264 wrote to memory of 564	1264	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	32
PID 1264 wrote to memory of 564	1264	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	32
PID 1264 wrote to memory of 564	1264	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	32
PID 1264 wrote to memory of 564	1264	fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe	32

C:\Users\Admin\AppData\Local\Temp\fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe
"C:\Users\Admin\AppData\Local\Temp\fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1128
- C:\Users\Admin\AppData\Local\Temp\fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe
  "C:\Users\Admin\AppData\Local\Temp\fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1144
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\3d724c8e-124f-443a-ad30-e024fb7ed4b4" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:800
- - C:\Users\Admin\AppData\Local\Temp\fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe
    "C:\Users\Admin\AppData\Local\Temp\fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:1264
  - - C:\Users\Admin\AppData\Local\Temp\fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe
      "C:\Users\Admin\AppData\Local\Temp\fe9867448fb67fcadeb9f432d363b93e06ac3e3a7bc87e44a93f1f16746ea2e5.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:564

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

File and Directory Permissions Modification

T1222

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/564-64-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1128-56-0x0000000000540000-0x000000000065B000-memory.dmp

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memory/1144-53-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1144-55-0x0000000074B41000-0x0000000074B43000-memory.dmp

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memory/1144-57-0x0000000000400000-0x0000000000537000-memory.dmp

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