wormlocker | 3798b488cc3188ae431d6583c93f86b788f7f1e719314b0e8079269284ecf87a

General

Target
3798b488cc3188ae431d6583c93f86b788f7f1e719314b0e8079269284ecf87a.exe
Size 329KB
Sample260605-27vq2ae19x
SHA256 3798b488cc3188ae431d6583c93f86b788f7f1e719314b0e8079269284ecf87a
MD5 73e4c81af87f1061d1d80dab15784c7c
SHA1 896638d18e206c8fd288390445c97d314c6ebfb3
SHA512 c853dcb267ff716ae3eec5a7a3573c56e25e88564335ee6a287d3fefbbc7a5152e7239eaa47131f59bad0cd6f169402d07c548a86b05cd065c4c3b33808c5fc1
SSDEEP 6144:4ibVlHNEHBpDDf2vfQ21NV0zUiCq6nd3YPiHKOwXsl52YXlb6WKFWmq:4gtCpPfGfZS6ndIPXaFbi8
TLSH
T14964F187B294C3A4D5BA047B1413D0B00B3A6C3B9C61E9FBB4C94E577762A131572BFA
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

defense_evasion discovery exploit wormlocker persistence ransomware

Malware Config

Signatures

Family: WormLocker
WormLocker is a ransomware written in C#.
ransomware wormlocker

Detects WormLocker payload 1 IoCs

resource	yara_rule
behavioral2/files/0x001900000002b504-14.dat	family_wormlocker

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "empty"	WormLocker2.0.exe

Disables Task Manager via registry modification
defense_evasion

Possible privilege escalation attempt 2 IoCs

exploit

pid	Process
4352	takeown.exe
1648	icacls.exe

Executes dropped EXE 1 IoCs

pid	Process
2356	WormLocker2.0.exe

Modifies file permissions 1 TTPs 2 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
4352	takeown.exe
1648	icacls.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File created	C:\Windows\System32\LogonUI.exe	3798b488cc3188ae431d6583c93f86b788f7f1e719314b0e8079269284ecf87a.exe
File opened for modification	C:\Windows\System32\LogonUIinf.exe	3798b488cc3188ae431d6583c93f86b788f7f1e719314b0e8079269284ecf87a.exe
File opened for modification	C:\Windows\System32\ransom_voice.vbs	3798b488cc3188ae431d6583c93f86b788f7f1e719314b0e8079269284ecf87a.exe
File opened for modification	C:\Windows\System32\WormLocker2.0.exe	3798b488cc3188ae431d6583c93f86b788f7f1e719314b0e8079269284ecf87a.exe
File created	C:\Windows\System32\LogonUItrue.exe	3798b488cc3188ae431d6583c93f86b788f7f1e719314b0e8079269284ecf87a.exe
File opened for modification	C:\Windows\System32\LogonUItrue.exe	3798b488cc3188ae431d6583c93f86b788f7f1e719314b0e8079269284ecf87a.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1636999435-3883760687-346127294-1000_Classes\Local Settings	WormLocker2.0.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2356	WormLocker2.0.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeTakeOwnershipPrivilege	4352	takeown.exe
Token: SeDebugPrivilege	2356	WormLocker2.0.exe
Token: 33	4084	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	4084	AUDIODG.EXE

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4940 wrote to memory of 4472	4940	3798b488cc3188ae431d6583c93f86b788f7f1e719314b0e8079269284ecf87a.exe	80
PID 4472 wrote to memory of 4352	4472	cmd.exe	82
PID 4472 wrote to memory of 1648	4472	cmd.exe	83
PID 4940 wrote to memory of 2356	4940	3798b488cc3188ae431d6583c93f86b788f7f1e719314b0e8079269284ecf87a.exe	84
PID 2356 wrote to memory of 1632	2356	WormLocker2.0.exe	87

C:\Users\Admin\AppData\Local\Temp\3798b488cc3188ae431d6583c93f86b788f7f1e719314b0e8079269284ecf87a.exe
"C:\Users\Admin\AppData\Local\Temp\3798b488cc3188ae431d6583c93f86b788f7f1e719314b0e8079269284ecf87a.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:4940
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32 && icacls C:\Windows\System32 /grant "%username%:F"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4472
- - C:\Windows\system32\takeown.exe
    takeown /f C:\Windows\System32
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    - Suspicious use of AdjustPrivilegeToken
    PID:4352
- - C:\Windows\system32\icacls.exe
    icacls C:\Windows\System32 /grant "Admin:F"
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    PID:1648
- C:\Windows\System32\WormLocker2.0.exe
  "C:\Windows\System32\WormLocker2.0.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2356
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Windows\System32\ransom_voice.vbs"
    3⤵
    PID:1632

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x00000000000004D8 0x00000000000004E8
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4084

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Defense Evasion

File and Directory Permissions Modification

Modify Registry

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

SP_A7DD3B329B254C55A9B6FA68D2239A7B.dat

Path C:\Users\Admin\AppData\Roaming\Microsoft\Speech\Files\UserLexicons\SP_A7DD3B329B254C55A9B6FA68D2239A7B.dat
Size 940B
SHA256 607c4722b09c159b4b522ca178d042128c34cc11a958e8412ef595279aa2e10f
MD5 1512fea0427f0409f08ec1572e894a7a
SHA1 bd1867dffda171e7d29c56236d3bd4bca5644b94
SHA512 76d5cdc317831840dbd74ccc55f5a9adeb116037ff37c1f0424528d71f93403288e85095fafd8a30b61fd81f7ae60a6c5854c9c63d9c4cd2afa730f4485aab7b
TLSH
T1D7112B4705800038FC36103C080311D683D00454311479107574D0C120162C128A4962
MD5 SHA1 SHA512 TLSH

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WormLocker2.0.exe

Path C:\Windows\System32\WormLocker2.0.exe
Size 116KB
SHA256 830c271c8aca775457a090a51c93ad08f9665361eeeaa3fda3f9ae032202ad73
MD5 041aa5e99ae545dac5f9306bb20d869e
SHA1 88ea126645bfd418abba44cca4a16adf12084d2f
SHA512 4b8007dddd519c77bb596f6d17f270da62b236894b6fd7f1c528e553b1aac3a7f9c0df4bb40b678461f70bde3c5a8ac4b5e97e5372dd127a8184862c7f6f4c7c
SSDEEP 3072:bDbhChcu7cIA5SvNdQGuI7hNVLokwLQLO3s/qY:bDf2vfQ21NV0zUiCq
TLSH
T155C3D01E73ECCBB2D13A22BB1C7500648F786D369839D4DA7C8B22DD7721A416991BD3
MD5 SHA1 SHA512 SSDEEP TLSH

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ransom_voice.vbs

Path C:\Windows\System32\ransom_voice.vbs
Size 397B
SHA256 d200a1e942b8cfdcd8190d1ad59f92e27e39b919ba230f2dd88d70c3df428c7b
MD5 c1f9613622f740c2f00c2fa8881ba7ba
SHA1 bf3271720634bebb3c41ef2b33af525b62f931bc
SHA512 49e00bb3c76f7e69818a889f045f3d3c43badf2116facccbbf69c61de19f91a42aee891b9a5b72a256453e2fc5c637adac1e354cf88e6782679afa886ad1c615
TLSH
T1A3E0F12D5F3801E31E923930335102C2EE4C4BDC52B058704C4E800D333CA23D874490
MD5 SHA1 SHA512 TLSH

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memory/2356-22-0x0000000000FC0000-0x0000000000FE2000-memory.dmp

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memory/4940-0-0x0000000000F00000-0x0000000000F58000-memory.dmp

Download

memory/4940-1-0x000000001C830000-0x000000001C840000-memory.dmp

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memory/4940-9-0x000000001C830000-0x000000001C840000-memory.dmp

Download

memory/4940-19-0x000000001C830000-0x000000001C840000-memory.dmp

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Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads