ryuk | 88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335

Analysis

max time kernel
150s
max time network
11s
platform
windows7_x64
resource
win7v20201028
submitted
18/01/2021, 11:45 UTC

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General

Target

88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe
Size

575KB
MD5

6cad2f7dc809b9353a31753a438aef4e
SHA1

459d816bb020f5da8257076a36d0ffd1f1f02d76
SHA256

88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335
SHA512

a67367990452bf21b7c0d0682c598422c78a5ed455a5d5e684d8fabb43366b0e9f9cd579a5f18123f6b1f97945f789904929838d1d893b70f450bfeafb243bb8

Score

10^/10

ryuk discovery ransomware

Malware Config

Signatures

Ryuk
Ransomware distributed via existing botnets, often Trickbot or Emotet.
ransomware ryuk

Modifies file permissions 1 TTPs 2 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
880	icacls.exe
1236	icacls.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 296 wrote to memory of 1236	296	88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe	29
PID 296 wrote to memory of 1236	296	88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe	29
PID 296 wrote to memory of 1236	296	88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe	29
PID 296 wrote to memory of 1236	296	88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe	29
PID 296 wrote to memory of 880	296	88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe	30
PID 296 wrote to memory of 880	296	88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe	30
PID 296 wrote to memory of 880	296	88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe	30
PID 296 wrote to memory of 880	296	88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe	30

C:\Users\Admin\AppData\Local\Temp\88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe
"C:\Users\Admin\AppData\Local\Temp\88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:296
- C:\Windows\SysWOW64\icacls.exe
  icacls "C:\*" /grant Everyone:F /T /C /Q
  2⤵
  - Modifies file permissions
  PID:1236
- C:\Windows\SysWOW64\icacls.exe
  icacls "D:\*" /grant Everyone:F /T /C /Q
  2⤵
  - Modifies file permissions
  PID:880

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

File and Directory Permissions Modification

T1222

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/296-2-0x0000000076381000-0x0000000076383000-memory.dmp

Filesize
8KB

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