ryuk | 4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539

Analysis

max time kernel
181s
max time network
229s
platform
windows10-2004_x64
resource
win10v2004-en-20220113
submitted
20/02/2022, 07:39

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General

Target

4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
Size

188KB
MD5

d2d3d877e06b0181b67c6e610b40c44c
SHA1

6a0dd2ab04d5b0b6869d5b7d9b4eb591087bace9
SHA256

4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539
SHA512

320cc4f1862425d706c4d369fa5f13a62cc9f3454dae91b239a28440c14dd92972b8d1cfa4fea699dc996e67c3a4db49b4c4ed6e63329492ee6cf8f4f7059cf0

Score

10^/10

ryuk ransomware

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\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]

Signatures

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

Executes dropped EXE 1 IoCs

pid	Process
4628	XaKdReS.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\Control Panel\International\Geo\Nation	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\Control Panel\International\Geo\Nation	XaKdReS.exe

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

System Information Discovery
T1082
Runs net.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
4628	XaKdReS.exe
4628	XaKdReS.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeBackupPrivilege	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
Token: SeBackupPrivilege	4628	XaKdReS.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 5088 wrote to memory of 4628	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	83
PID 5088 wrote to memory of 4628	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	83
PID 5088 wrote to memory of 4628	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	83
PID 5088 wrote to memory of 3436	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	84
PID 5088 wrote to memory of 3436	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	84
PID 5088 wrote to memory of 3436	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	84
PID 3436 wrote to memory of 3632	3436	net.exe	86
PID 3436 wrote to memory of 3632	3436	net.exe	86
PID 3436 wrote to memory of 3632	3436	net.exe	86
PID 5088 wrote to memory of 4436	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	87
PID 5088 wrote to memory of 4436	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	87
PID 5088 wrote to memory of 4436	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	87
PID 4436 wrote to memory of 1272	4436	net.exe	89
PID 4436 wrote to memory of 1272	4436	net.exe	89
PID 4436 wrote to memory of 1272	4436	net.exe	89
PID 5088 wrote to memory of 2668	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	91
PID 5088 wrote to memory of 2668	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	91
PID 5088 wrote to memory of 2668	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	91
PID 2668 wrote to memory of 1772	2668	net.exe	93
PID 2668 wrote to memory of 1772	2668	net.exe	93
PID 2668 wrote to memory of 1772	2668	net.exe	93
PID 5088 wrote to memory of 4616	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	94
PID 5088 wrote to memory of 4616	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	94
PID 5088 wrote to memory of 4616	5088	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	94
PID 4616 wrote to memory of 3976	4616	net.exe	96
PID 4616 wrote to memory of 3976	4616	net.exe	96
PID 4616 wrote to memory of 3976	4616	net.exe	96
PID 4628 wrote to memory of 4356	4628	XaKdReS.exe	97
PID 4628 wrote to memory of 4356	4628	XaKdReS.exe	97
PID 4628 wrote to memory of 4356	4628	XaKdReS.exe	97
PID 4628 wrote to memory of 4136	4628	XaKdReS.exe	99
PID 4628 wrote to memory of 4136	4628	XaKdReS.exe	99
PID 4628 wrote to memory of 4136	4628	XaKdReS.exe	99
PID 4136 wrote to memory of 3048	4136	net.exe	101
PID 4136 wrote to memory of 3048	4136	net.exe	101
PID 4136 wrote to memory of 3048	4136	net.exe	101
PID 4356 wrote to memory of 3936	4356	net.exe	102
PID 4356 wrote to memory of 3936	4356	net.exe	102
PID 4356 wrote to memory of 3936	4356	net.exe	102

C:\Users\Admin\AppData\Local\Temp\4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
"C:\Users\Admin\AppData\Local\Temp\4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5088
- C:\Users\Admin\AppData\Local\Temp\XaKdReS.exe
  "C:\Users\Admin\AppData\Local\Temp\XaKdReS.exe" 8 LAN
  2⤵
  - Executes dropped EXE
  - Checks computer location settings
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4628
- - C:\Windows\SysWOW64\net.exe
    "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4356
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 stop "audioendpointbuilder" /y
      4⤵
      PID:3936
- - C:\Windows\SysWOW64\net.exe
    "C:\Windows\System32\net.exe" stop "samss" /y
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4136
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 stop "samss" /y
      4⤵
      PID:3048
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3436
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "audioendpointbuilder" /y
    3⤵
    PID:3632
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4436
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:1272
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2668
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "audioendpointbuilder" /y
    3⤵
    PID:1772
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4616
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:3976

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Windows 7 deprecation

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