ryuk | ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f

Analysis

max time kernel
204s
max time network
28s
platform
windows7_x64
resource
win7-en-20211208
submitted
20-02-2022 03:26

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General

Target

ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe
Size

168KB
MD5

8ebc7a62a10f80deba528943af806064
SHA1

03ded58db9c70793fe4ef1837078ff2780358efb
SHA256

ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f
SHA512

ff00db4bee7997a561ec8a2281299191f9012e361ad4f593c9706bf43d7f97466bcf1de3da2674fa42b3cd8091ad3a680c915392ae9f595363214c78ef1862a2

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> [email protected] </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
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 3 IoCs

pid	Process
668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe
668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe
668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeBackupPrivilege	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe

Suspicious use of WriteProcessMemory 32 IoCs

description	pid	Process	procid_target
PID 668 wrote to memory of 1944	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	29
PID 668 wrote to memory of 1944	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	29
PID 668 wrote to memory of 1944	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	29
PID 668 wrote to memory of 1944	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	29
PID 1944 wrote to memory of 2168	1944	net.exe	31
PID 1944 wrote to memory of 2168	1944	net.exe	31
PID 1944 wrote to memory of 2168	1944	net.exe	31
PID 1944 wrote to memory of 2168	1944	net.exe	31
PID 668 wrote to memory of 2628	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	32
PID 668 wrote to memory of 2628	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	32
PID 668 wrote to memory of 2628	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	32
PID 668 wrote to memory of 2628	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	32
PID 2628 wrote to memory of 2708	2628	net.exe	34
PID 2628 wrote to memory of 2708	2628	net.exe	34
PID 2628 wrote to memory of 2708	2628	net.exe	34
PID 2628 wrote to memory of 2708	2628	net.exe	34
PID 668 wrote to memory of 8572	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	35
PID 668 wrote to memory of 8572	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	35
PID 668 wrote to memory of 8572	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	35
PID 668 wrote to memory of 8572	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	35
PID 8572 wrote to memory of 8596	8572	net.exe	37
PID 8572 wrote to memory of 8596	8572	net.exe	37
PID 8572 wrote to memory of 8596	8572	net.exe	37
PID 8572 wrote to memory of 8596	8572	net.exe	37
PID 668 wrote to memory of 8632	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	38
PID 668 wrote to memory of 8632	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	38
PID 668 wrote to memory of 8632	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	38
PID 668 wrote to memory of 8632	668	ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe	38
PID 8632 wrote to memory of 8656	8632	net.exe	40
PID 8632 wrote to memory of 8656	8632	net.exe	40
PID 8632 wrote to memory of 8656	8632	net.exe	40
PID 8632 wrote to memory of 8656	8632	net.exe	40

C:\Users\Admin\AppData\Local\Temp\ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe
"C:\Users\Admin\AppData\Local\Temp\ab5b8853961dbd4013c2fb44403eba2ac32abfbf4f65e2d32d83c5c642591e5f.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:668
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1944
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "audioendpointbuilder" /y
    3⤵
    PID:2168
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2628
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:2708
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:8572
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:8596
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:8632
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:8656

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/668-54-0x0000000076451000-0x0000000076453000-memory.dmp

Filesize
8KB

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