ryuk | e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c

Analysis

max time kernel
175s
max time network
146s
platform
windows7_x64
resource
win7-en-20211208
submitted
20-02-2022 00:59

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General

Target

e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe
Size

214KB
MD5

4d3454c85d85856674bb6e835f139649
SHA1

a8d64f6dddff26b423793e08994a6ee19077c1f7
SHA256

e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c
SHA512

e713ee2c5fe12dfa27e8294ce1a6415221cccead720dd5163d6ccb399518a810ad567db39023a763ce39a8b861b39400f1faa56d8398c7c64fa7a5fdc2010c6c

Score

10^/10

ryuk discovery 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:\Documents and Settings\Admin\AppData\Local\Application Data\Application Data\Application Data\Application Data\Application Data\Application Data\Application Data\Application Data\Application Data\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
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

Executes dropped EXE 1 IoCs

pid	Process
800	eipBirJ.exe

Loads dropped DLL 2 IoCs

pid	Process
948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe
948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe

Modifies file permissions 1 TTPs 8 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
1680	icacls.exe
1080	icacls.exe
1088	icacls.exe
1684	icacls.exe
1076	icacls.exe
1160	icacls.exe
360	icacls.exe
628	icacls.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2329389628-4064185017-3901522362-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run	reg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2329389628-4064185017-3901522362-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\Users\\Admin\\AppData\\Local\\Temp\\e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.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

Interacts with shadow copies 2 TTPs 2 IoCs

Shadow copies are often targeted by ransomware to inhibit system recovery.

ransomware

File Deletion

T1107

Inhibit System Recovery

T1490

pid	Process
1704	vssadmin.exe
568	vssadmin.exe

Runs net.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe
948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe
948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe
948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe
948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe
Token: SeBackupPrivilege	800	eipBirJ.exe
Token: SeBackupPrivilege	1124	taskhost.exe
Token: SeBackupPrivilege	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe
Token: SeBackupPrivilege	2012	vssvc.exe
Token: SeRestorePrivilege	2012	vssvc.exe
Token: SeAuditPrivilege	2012	vssvc.exe
Token: SeBackupPrivilege	1232	Dwm.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 948 wrote to memory of 800	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	27
PID 948 wrote to memory of 800	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	27
PID 948 wrote to memory of 800	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	27
PID 948 wrote to memory of 1124	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	17
PID 948 wrote to memory of 468	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	28
PID 948 wrote to memory of 468	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	28
PID 948 wrote to memory of 468	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	28
PID 948 wrote to memory of 1232	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	16
PID 948 wrote to memory of 704	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	30
PID 948 wrote to memory of 704	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	30
PID 948 wrote to memory of 704	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	30
PID 468 wrote to memory of 1432	468	net.exe	32
PID 468 wrote to memory of 1432	468	net.exe	32
PID 468 wrote to memory of 1432	468	net.exe	32
PID 704 wrote to memory of 628	704	net.exe	33
PID 704 wrote to memory of 628	704	net.exe	33
PID 704 wrote to memory of 628	704	net.exe	33
PID 948 wrote to memory of 1684	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	37
PID 948 wrote to memory of 1684	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	37
PID 948 wrote to memory of 1684	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	37
PID 948 wrote to memory of 1088	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	36
PID 948 wrote to memory of 1088	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	36
PID 948 wrote to memory of 1088	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	36
PID 800 wrote to memory of 1080	800	eipBirJ.exe	34
PID 800 wrote to memory of 1080	800	eipBirJ.exe	34
PID 800 wrote to memory of 1080	800	eipBirJ.exe	34
PID 948 wrote to memory of 1056	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	35
PID 948 wrote to memory of 1056	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	35
PID 948 wrote to memory of 1056	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	35
PID 800 wrote to memory of 1160	800	eipBirJ.exe	40
PID 800 wrote to memory of 1160	800	eipBirJ.exe	40
PID 800 wrote to memory of 1160	800	eipBirJ.exe	40
PID 800 wrote to memory of 1392	800	eipBirJ.exe	43
PID 800 wrote to memory of 1392	800	eipBirJ.exe	43
PID 800 wrote to memory of 1392	800	eipBirJ.exe	43
PID 1124 wrote to memory of 1076	1124	taskhost.exe	39
PID 1124 wrote to memory of 1076	1124	taskhost.exe	39
PID 1124 wrote to memory of 1076	1124	taskhost.exe	39
PID 1124 wrote to memory of 360	1124	taskhost.exe	46
PID 1124 wrote to memory of 360	1124	taskhost.exe	46
PID 1124 wrote to memory of 360	1124	taskhost.exe	46
PID 1056 wrote to memory of 1704	1056	cmd.exe	50
PID 1392 wrote to memory of 568	1392	cmd.exe	51
PID 1056 wrote to memory of 1704	1056	cmd.exe	50
PID 1392 wrote to memory of 568	1392	cmd.exe	51
PID 1056 wrote to memory of 1704	1056	cmd.exe	50
PID 1392 wrote to memory of 568	1392	cmd.exe	51
PID 1232 wrote to memory of 628	1232	Dwm.exe	56
PID 1232 wrote to memory of 628	1232	Dwm.exe	56
PID 1232 wrote to memory of 628	1232	Dwm.exe	56
PID 1232 wrote to memory of 1680	1232	Dwm.exe	57
PID 1232 wrote to memory of 1680	1232	Dwm.exe	57
PID 1232 wrote to memory of 1680	1232	Dwm.exe	57
PID 948 wrote to memory of 916	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	61
PID 948 wrote to memory of 916	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	61
PID 948 wrote to memory of 916	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	61
PID 916 wrote to memory of 1196	916	net.exe	63
PID 916 wrote to memory of 1196	916	net.exe	63
PID 916 wrote to memory of 1196	916	net.exe	63
PID 948 wrote to memory of 1672	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	65
PID 948 wrote to memory of 1672	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	65
PID 948 wrote to memory of 1672	948	e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe	65
PID 1672 wrote to memory of 992	1672	net.exe	67
PID 1672 wrote to memory of 992	1672	net.exe	67

C:\Windows\system32\Dwm.exe
"C:\Windows\system32\Dwm.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1232
- C:\Windows\system32\icacls.exe
  icacls "C:\*" /grant Everyone:F /T /C /Q
  2⤵
  - Modifies file permissions
  PID:628
- C:\Windows\system32\icacls.exe
  icacls "D:\*" /grant Everyone:F /T /C /Q
  2⤵
  - Modifies file permissions
  PID:1680

C:\Windows\system32\taskhost.exe
"taskhost.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1124
- C:\Windows\system32\icacls.exe
  icacls "C:\*" /grant Everyone:F /T /C /Q
  2⤵
  - Modifies file permissions
  PID:1076
- C:\Windows\system32\icacls.exe
  icacls "D:\*" /grant Everyone:F /T /C /Q
  2⤵
  - Modifies file permissions
  PID:360

C:\Users\Admin\AppData\Local\Temp\e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe
"C:\Users\Admin\AppData\Local\Temp\e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe"
1⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:948
- C:\Users\Admin\AppData\Local\Temp\eipBirJ.exe
  "C:\Users\Admin\AppData\Local\Temp\eipBirJ.exe" 8 LAN
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:800
- - C:\Windows\system32\icacls.exe
    icacls "C:\*" /grant Everyone:F /T /C /Q
    3⤵
    - Modifies file permissions
    PID:1080
- - C:\Windows\system32\icacls.exe
    icacls "D:\*" /grant Everyone:F /T /C /Q
    3⤵
    - Modifies file permissions
    PID:1160
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c vssadmin.exe Delete Shadows /all /quiet
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1392
  - - C:\Windows\system32\vssadmin.exe
      vssadmin.exe Delete Shadows /all /quiet
      4⤵
      Interacts with shadow copies
      PID:568
- C:\Windows\System32\net.exe
  "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:468
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 stop "audioendpointbuilder" /y
    3⤵
    PID:1432
- C:\Windows\System32\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:704
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:628
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c vssadmin.exe Delete Shadows /all /quiet
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1056
- - C:\Windows\system32\vssadmin.exe
    vssadmin.exe Delete Shadows /all /quiet
    3⤵
    - Interacts with shadow copies
    PID:1704
- C:\Windows\system32\icacls.exe
  icacls "D:\*" /grant Everyone:F /T /C /Q
  2⤵
  - Modifies file permissions
  PID:1088
- C:\Windows\system32\icacls.exe
  icacls "C:\*" /grant Everyone:F /T /C /Q
  2⤵
  - Modifies file permissions
  PID:1684
- C:\Windows\System32\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:916
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:1196
- C:\Windows\System32\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1672
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:992
- C:\Windows\System32\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\e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe" /f
  2⤵
  PID:1588
- - C:\Windows\system32\reg.exe
    REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\e5ceb42928a16190aeb1a9893c89e808a756a30193ccd542f63c726da7d9fa5c.exe" /f
    3⤵
    - Adds Run key to start application
    PID:2360
- C:\Windows\System32\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  PID:2004
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:1288

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2012

C:\Windows\system32\Dwm.exe
"C:\Windows\system32\Dwm.exe"
1⤵
PID:988

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

File Deletion

T1107

File and Directory Permissions Modification

T1222

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Inhibit System Recovery

T1490

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Downloads

memory/948-55-0x000007FEFBC31000-0x000007FEFBC33000-memory.dmp

Filesize
8KB

Download
memory/1124-61-0x000000013FE20000-0x000000013FF97000-memory.dmp

Filesize
1.5MB

Download
memory/1124-59-0x000000013FE20000-0x000000013FF97000-memory.dmp

Filesize
1.5MB

Download