ryuk | 88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335

Analysis

max time kernel
145s
max time network
160s
platform
windows10-2004_x64
resource
win10v2004-en-20220112
submitted
05-03-2022 21:08

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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

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note

<html><body><p style="font-weight:bold;font-size:125%;top:0;left:0;"> [email protected] <br> </p><p style="position:absolute;bottom:0;right:1%;font-weight:bold;font-size:170%">balance of shadow universe</p><div style="font-size: 550%;font-weight:bold;width:50%;height:50%;overflow:auto;margin:auto;position:absolute;top:35%;left:40%;">Ryuk</div></body></html�

Emails

[email protected]

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\RyukReadMe.html

Family

ryuk

Ransom Note

[email protected] balance of shadow universe Ryuk

Emails

[email protected]

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
1152	icacls.exe
1996	icacls.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1800	2720	WerFault.exe	52

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2720 wrote to memory of 1152	2720	88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe	63
PID 2720 wrote to memory of 1152	2720	88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe	63
PID 2720 wrote to memory of 1152	2720	88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe	63
PID 2720 wrote to memory of 1996	2720	88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe	64
PID 2720 wrote to memory of 1996	2720	88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe	64
PID 2720 wrote to memory of 1996	2720	88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe	64

C:\Users\Admin\AppData\Local\Temp\88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe
"C:\Users\Admin\AppData\Local\Temp\88b1b4966650de59cef20c340b28739c52dc9ead91d9959a338a8e531ad38335.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2720
- C:\Windows\SysWOW64\icacls.exe
  icacls "C:\*" /grant Everyone:F /T /C /Q
  2⤵
  - Modifies file permissions
  PID:1152
- C:\Windows\SysWOW64\icacls.exe
  icacls "D:\*" /grant Everyone:F /T /C /Q
  2⤵
  - Modifies file permissions
  PID:1996
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2720 -s 1120
  2⤵
  - Program crash
  PID:1800

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 2720 -ip 2720
1⤵
PID:3392

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

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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