ryuk | d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f

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

Processes:

UOBpfwJ.exe

pid process

268 UOBpfwJ.exe

pid	process
268	UOBpfwJ.exe

Loads dropped DLL 2 IoCs

Processes:

d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe

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

Processes:

reg.exereg.exe

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

Processes:

d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exeUOBpfwJ.exe

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

Processes:

d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exeUOBpfwJ.exe

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

Suspicious use of WriteProcessMemory 64 IoCs

Processes:

d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exenet.exenet.exeUOBpfwJ.exenet.exenet.execmd.exenet.execmd.exe

description	pid	process	target process
PID 1600 wrote to memory of 268	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	UOBpfwJ.exe
PID 1600 wrote to memory of 268	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	UOBpfwJ.exe
PID 1600 wrote to memory of 268	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	UOBpfwJ.exe
PID 1600 wrote to memory of 268	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	UOBpfwJ.exe
PID 1600 wrote to memory of 1096	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	taskhost.exe
PID 1600 wrote to memory of 560	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1600 wrote to memory of 560	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1600 wrote to memory of 560	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1600 wrote to memory of 560	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 560 wrote to memory of 568	560	net.exe	net1.exe
PID 560 wrote to memory of 568	560	net.exe	net1.exe
PID 560 wrote to memory of 568	560	net.exe	net1.exe
PID 560 wrote to memory of 568	560	net.exe	net1.exe
PID 1600 wrote to memory of 1092	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1600 wrote to memory of 1092	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1600 wrote to memory of 1092	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1600 wrote to memory of 1092	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1600 wrote to memory of 1180	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	Dwm.exe
PID 1092 wrote to memory of 772	1092	net.exe	net1.exe
PID 1092 wrote to memory of 772	1092	net.exe	net1.exe
PID 1092 wrote to memory of 772	1092	net.exe	net1.exe
PID 1092 wrote to memory of 772	1092	net.exe	net1.exe
PID 268 wrote to memory of 976	268	UOBpfwJ.exe	net.exe
PID 268 wrote to memory of 976	268	UOBpfwJ.exe	net.exe
PID 268 wrote to memory of 976	268	UOBpfwJ.exe	net.exe
PID 268 wrote to memory of 976	268	UOBpfwJ.exe	net.exe
PID 976 wrote to memory of 1928	976	net.exe	net1.exe
PID 976 wrote to memory of 1928	976	net.exe	net1.exe
PID 976 wrote to memory of 1928	976	net.exe	net1.exe
PID 976 wrote to memory of 1928	976	net.exe	net1.exe
PID 1600 wrote to memory of 1132	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1600 wrote to memory of 1132	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1600 wrote to memory of 1132	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1600 wrote to memory of 1132	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1132 wrote to memory of 1248	1132	net.exe	net1.exe
PID 1132 wrote to memory of 1248	1132	net.exe	net1.exe
PID 1132 wrote to memory of 1248	1132	net.exe	net1.exe
PID 1132 wrote to memory of 1248	1132	net.exe	net1.exe
PID 1600 wrote to memory of 2044	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	cmd.exe
PID 1600 wrote to memory of 2044	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	cmd.exe
PID 1600 wrote to memory of 2044	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	cmd.exe
PID 1600 wrote to memory of 2044	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	cmd.exe
PID 2044 wrote to memory of 1688	2044	cmd.exe	reg.exe
PID 2044 wrote to memory of 1688	2044	cmd.exe	reg.exe
PID 2044 wrote to memory of 1688	2044	cmd.exe	reg.exe
PID 2044 wrote to memory of 1688	2044	cmd.exe	reg.exe
PID 268 wrote to memory of 6756	268	UOBpfwJ.exe	cmd.exe
PID 268 wrote to memory of 6756	268	UOBpfwJ.exe	cmd.exe
PID 268 wrote to memory of 6756	268	UOBpfwJ.exe	cmd.exe
PID 268 wrote to memory of 6756	268	UOBpfwJ.exe	cmd.exe
PID 1600 wrote to memory of 7264	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1600 wrote to memory of 7264	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1600 wrote to memory of 7264	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1600 wrote to memory of 7264	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 7264 wrote to memory of 7292	7264	net.exe	net1.exe
PID 7264 wrote to memory of 7292	7264	net.exe	net1.exe
PID 7264 wrote to memory of 7292	7264	net.exe	net1.exe
PID 7264 wrote to memory of 7292	7264	net.exe	net1.exe
PID 6756 wrote to memory of 7300	6756	cmd.exe	reg.exe
PID 6756 wrote to memory of 7300	6756	cmd.exe	reg.exe
PID 6756 wrote to memory of 7300	6756	cmd.exe	reg.exe
PID 6756 wrote to memory of 7300	6756	cmd.exe	reg.exe
PID 1600 wrote to memory of 7760	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe
PID 1600 wrote to memory of 7760	1600	d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe	net.exe

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 Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys\08e575673cce10c72090304839888e02_bc8e1036-7fb3-448e-8ad9-a824b1a03b8e
MD5
93a5aadeec082ffc1bca5aa27af70f52

SHA1
47a92aee3ea4d1c1954ed4da9f86dd79d9277d31

SHA256
a1a21799e98f97f271657ce656076f33dcb020d9370f1f2671d783cafd230294

SHA512
df388c8d83e779e006d6311b2046fcf9259ec33d379fc0e2c6a4b6b90418f587a12c5c23acd488413a02568ca2d3effe04608ec7c791925c7ed53dc71093ca45

Download Submit
C:\Users\Admin\AppData\Local\Temp\RyukReadMe.html
MD5
5cedf73dbf75099b8abcefc3f07e9975

SHA1
2ecabc828715573e9d7aefaf82bfb0e7379e92cc

SHA256
beb3695bb9be64d641570104a56889b776cdbebd9c132045c52b9543d1f82b63

SHA512
dfe8485e7138ee9d0a03b9f3000bc8513856f82b51d2ef9f7c6be66b28ea0df86521c2b3b3c575f11061b3820758f280a99fbf77e482fa34c3a53c40c3928c56

Download Submit
C:\Users\Admin\AppData\Local\Temp\UOBpfwJ.exe
MD5
9c2f2398a853063303817e181b7cd140

SHA1
f0c032844d33537e7f270374f1f1c28ef7670683

SHA256
d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f

SHA512
4ad5d989e5e50c7cd9a5f65de4312fe63e53c97ceddd9b33a4a026c1b2fccdc27ac7406f3ec38132fb6da6c5439396bed2fee482775f55e265934fdc80425319

Download Submit
\Users\Admin\AppData\Local\Temp\UOBpfwJ.exe
MD5
9c2f2398a853063303817e181b7cd140

SHA1
f0c032844d33537e7f270374f1f1c28ef7670683

SHA256
d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f

SHA512
4ad5d989e5e50c7cd9a5f65de4312fe63e53c97ceddd9b33a4a026c1b2fccdc27ac7406f3ec38132fb6da6c5439396bed2fee482775f55e265934fdc80425319

Download Submit
\Users\Admin\AppData\Local\Temp\UOBpfwJ.exe
MD5
9c2f2398a853063303817e181b7cd140

SHA1
f0c032844d33537e7f270374f1f1c28ef7670683

SHA256
d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f

SHA512
4ad5d989e5e50c7cd9a5f65de4312fe63e53c97ceddd9b33a4a026c1b2fccdc27ac7406f3ec38132fb6da6c5439396bed2fee482775f55e265934fdc80425319

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

Filesize
1.4MB

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

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads