ryuk | d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f

Analysis

max time kernel
167s
max time network
148s
platform
windows7_x64
resource
win7-en-20211208
submitted
20/02/2022, 01:31

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General

Target

d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe
Size

192KB
MD5

9c2f2398a853063303817e181b7cd140
SHA1

f0c032844d33537e7f270374f1f1c28ef7670683
SHA256

d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f
SHA512

4ad5d989e5e50c7cd9a5f65de4312fe63e53c97ceddd9b33a4a026c1b2fccdc27ac7406f3ec38132fb6da6c5439396bed2fee482775f55e265934fdc80425319

Score

10^/10

ryuk persistence 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]

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

Executes dropped EXE 1 IoCs

pid	Process
268	UOBpfwJ.exe

Loads dropped DLL 2 IoCs

pid	Process
1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe
1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\Users\\Admin\\AppData\\Local\\Temp\\d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe"	reg.exe
Key created	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\Users\\Admin\\AppData\\Local\\Temp\\UOBpfwJ.exe"	reg.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 10 IoCs

pid	Process
1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe
1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe
268	UOBpfwJ.exe
1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe
1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe
268	UOBpfwJ.exe
1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe
1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe
1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe
268	UOBpfwJ.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe
Token: SeBackupPrivilege	268	UOBpfwJ.exe
Token: SeBackupPrivilege	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 1600 wrote to memory of 268	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	27
PID 1600 wrote to memory of 268	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	27
PID 1600 wrote to memory of 268	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	27
PID 1600 wrote to memory of 268	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	27
PID 1600 wrote to memory of 1096	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	10
PID 1600 wrote to memory of 560	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	28
PID 1600 wrote to memory of 560	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	28
PID 1600 wrote to memory of 560	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	28
PID 1600 wrote to memory of 560	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	28
PID 560 wrote to memory of 568	560	net.exe	30
PID 560 wrote to memory of 568	560	net.exe	30
PID 560 wrote to memory of 568	560	net.exe	30
PID 560 wrote to memory of 568	560	net.exe	30
PID 1600 wrote to memory of 1092	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	31
PID 1600 wrote to memory of 1092	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	31
PID 1600 wrote to memory of 1092	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	31
PID 1600 wrote to memory of 1092	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	31
PID 1600 wrote to memory of 1180	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	19
PID 1092 wrote to memory of 772	1092	net.exe	33
PID 1092 wrote to memory of 772	1092	net.exe	33
PID 1092 wrote to memory of 772	1092	net.exe	33
PID 1092 wrote to memory of 772	1092	net.exe	33
PID 268 wrote to memory of 976	268	UOBpfwJ.exe	34
PID 268 wrote to memory of 976	268	UOBpfwJ.exe	34
PID 268 wrote to memory of 976	268	UOBpfwJ.exe	34
PID 268 wrote to memory of 976	268	UOBpfwJ.exe	34
PID 976 wrote to memory of 1928	976	net.exe	36
PID 976 wrote to memory of 1928	976	net.exe	36
PID 976 wrote to memory of 1928	976	net.exe	36
PID 976 wrote to memory of 1928	976	net.exe	36
PID 1600 wrote to memory of 1132	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	37
PID 1600 wrote to memory of 1132	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	37
PID 1600 wrote to memory of 1132	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	37
PID 1600 wrote to memory of 1132	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	37
PID 1132 wrote to memory of 1248	1132	net.exe	39
PID 1132 wrote to memory of 1248	1132	net.exe	39
PID 1132 wrote to memory of 1248	1132	net.exe	39
PID 1132 wrote to memory of 1248	1132	net.exe	39
PID 1600 wrote to memory of 2044	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	40
PID 1600 wrote to memory of 2044	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	40
PID 1600 wrote to memory of 2044	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	40
PID 1600 wrote to memory of 2044	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	40
PID 2044 wrote to memory of 1688	2044	cmd.exe	42
PID 2044 wrote to memory of 1688	2044	cmd.exe	42
PID 2044 wrote to memory of 1688	2044	cmd.exe	42
PID 2044 wrote to memory of 1688	2044	cmd.exe	42
PID 268 wrote to memory of 6756	268	UOBpfwJ.exe	43
PID 268 wrote to memory of 6756	268	UOBpfwJ.exe	43
PID 268 wrote to memory of 6756	268	UOBpfwJ.exe	43
PID 268 wrote to memory of 6756	268	UOBpfwJ.exe	43
PID 1600 wrote to memory of 7264	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	45
PID 1600 wrote to memory of 7264	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	45
PID 1600 wrote to memory of 7264	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	45
PID 1600 wrote to memory of 7264	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	45
PID 7264 wrote to memory of 7292	7264	net.exe	47
PID 7264 wrote to memory of 7292	7264	net.exe	47
PID 7264 wrote to memory of 7292	7264	net.exe	47
PID 7264 wrote to memory of 7292	7264	net.exe	47
PID 6756 wrote to memory of 7300	6756	cmd.exe	48
PID 6756 wrote to memory of 7300	6756	cmd.exe	48
PID 6756 wrote to memory of 7300	6756	cmd.exe	48
PID 6756 wrote to memory of 7300	6756	cmd.exe	48
PID 1600 wrote to memory of 7760	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	49
PID 1600 wrote to memory of 7760	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	49

C:\Windows\system32\taskhost.exe
"taskhost.exe"
1⤵
PID:1096

C:\Windows\system32\Dwm.exe
"C:\Windows\system32\Dwm.exe"
1⤵
PID:1180

C:\Users\Admin\AppData\Local\Temp\d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe
"C:\Users\Admin\AppData\Local\Temp\d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe"
1⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1600
- C:\Users\Admin\AppData\Local\Temp\UOBpfwJ.exe
  "C:\Users\Admin\AppData\Local\Temp\UOBpfwJ.exe" 8 LAN
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:268
- - C:\Windows\SysWOW64\net.exe
    "C:\Windows\System32\net.exe" stop "samss" /y
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:976
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 stop "samss" /y
      4⤵
      PID:1928
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\UOBpfwJ.exe" /f /reg:64
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:6756
  - - C:\Windows\SysWOW64\reg.exe
      REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\UOBpfwJ.exe" /f /reg:64
      4⤵
      Adds Run key to start application
      PID:7300
- - C:\Windows\SysWOW64\net.exe
    "C:\Windows\System32\net.exe" stop "samss" /y
    3⤵
    PID:8372
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 stop "samss" /y
      4⤵
      PID:8456
- - C:\Windows\SysWOW64\net.exe
    "C:\Windows\System32\net.exe" stop "samss" /y
    3⤵
    PID:40840
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 stop "samss" /y
      4⤵
      PID:40868
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:560
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "audioendpointbuilder" /y
    3⤵
    PID:568
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1092
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:772
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1132
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:1248
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe" /f /reg:64
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2044
- - C:\Windows\SysWOW64\reg.exe
    REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe" /f /reg:64
    3⤵
    - Adds Run key to start application
    PID:1688
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:7264
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:7292
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  PID:7760
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:7784
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  PID:40740
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:40764
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  PID:40800
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:40828

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1096-59-0x0000000030000000-0x0000000030170000-memory.dmp

Filesize
1.4MB

Download
memory/1600-54-0x0000000075CE1000-0x0000000075CE3000-memory.dmp

Filesize
8KB

Download