ryuk | d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488

Analysis

max time kernel
150s
max time network
9s
platform
windows7_x64
resource
win7v20210410
submitted
04/05/2021, 16:10

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General

Target

mSRChoAYDlan.exe
Size

140KB
MD5

c0f972c5e033c0b4dc268a805cfa16a2
SHA1

a3f38579feb14d3b20289e453b41d88232145f68
SHA256

d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488
SHA512

de7803c4119355be7e06616abbfbf44b4ee23ba2caa987b630ad520126187c1f9eb2308f0ba5ba51cc8287fa75e5251d4e9d5ad940e8beb90b97f65d4890ca47

Score

10^/10

ryuk discovery ransomware

Malware Config

Extracted

Path

C:\$Recycle.Bin\RyukReadMe.html

Family

ryuk

Ransom Note

contact balance of shadow universe Ryuk $password = '3y5fSfK'; $torlink = 'http://ojaiemvqphz6dgg7gncqpdlbx2aoisftpwvrhda67uth6ncuax2ghyad.onion'; function info(){alert("INSTRUCTION:\r\n1. Download tor browser.\r\n2. Open link through tor browser: " + $torlink + "\r\n3. Fill the form, your password: "+ $password +"\r\nWe will contact you shortly.\r\nAlways send files for test decryption.");};

URLs

http://ojaiemvqphz6dgg7gncqpdlbx2aoisftpwvrhda67uth6ncuax2ghyad.onion

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
1544	iKGXrpzkzrep.exe
888	VAgOHVnjGlan.exe

Loads dropped DLL 4 IoCs

pid	Process
1084	mSRChoAYDlan.exe
1084	mSRChoAYDlan.exe
1084	mSRChoAYDlan.exe
1084	mSRChoAYDlan.exe

Modifies file permissions 1 TTPs 2 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
1480	icacls.exe
1472	icacls.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1084 wrote to memory of 1544	1084	mSRChoAYDlan.exe	29
PID 1084 wrote to memory of 1544	1084	mSRChoAYDlan.exe	29
PID 1084 wrote to memory of 1544	1084	mSRChoAYDlan.exe	29
PID 1084 wrote to memory of 1544	1084	mSRChoAYDlan.exe	29
PID 1084 wrote to memory of 888	1084	mSRChoAYDlan.exe	30
PID 1084 wrote to memory of 888	1084	mSRChoAYDlan.exe	30
PID 1084 wrote to memory of 888	1084	mSRChoAYDlan.exe	30
PID 1084 wrote to memory of 888	1084	mSRChoAYDlan.exe	30

C:\Users\Admin\AppData\Local\Temp\mSRChoAYDlan.exe
"C:\Users\Admin\AppData\Local\Temp\mSRChoAYDlan.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1084
- C:\Users\Admin\AppData\Local\Temp\iKGXrpzkzrep.exe
  "C:\Users\Admin\AppData\Local\Temp\iKGXrpzkzrep.exe" 9 REP
  2⤵
  - Executes dropped EXE
  PID:1544
- C:\Users\Admin\AppData\Local\Temp\VAgOHVnjGlan.exe
  "C:\Users\Admin\AppData\Local\Temp\VAgOHVnjGlan.exe" 8 LAN
  2⤵
  - Executes dropped EXE
  PID:888
- C:\Users\Admin\AppData\Local\Temp\GiJAqpzWGlan.exe
  "C:\Users\Admin\AppData\Local\Temp\GiJAqpzWGlan.exe" 8 LAN
  2⤵
  PID:992
- C:\Windows\SysWOW64\icacls.exe
  icacls "C:\*" /grant Everyone:F /T /C /Q
  2⤵
  - Modifies file permissions
  PID:1480
- C:\Windows\SysWOW64\icacls.exe
  icacls "D:\*" /grant Everyone:F /T /C /Q
  2⤵
  - Modifies file permissions
  PID:1472

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

File and Directory Permissions Modification

T1222

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1084-60-0x00000000752F1000-0x00000000752F3000-memory.dmp

Filesize
8KB

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