mountlocker | 85b53edb2e3476bdb29f98bd19c56baa0205e6620917e654cbe81c9745d6193d

Resubmissions

30-04-2024 05:29

240430-f6xncade75 10

11-04-2024 13:06

240411-qb4taafb9w 10

11-04-2024 12:33

240411-pq9seaeg2z 10

Analysis

max time kernel
439s
max time network
1161s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
11-04-2024 13:06

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General

Target

ed6e7169456ef1f41f6a45812dda7d98_JaffaCakes118.dll
Size

56KB
MD5

ed6e7169456ef1f41f6a45812dda7d98
SHA1

c82733e2d394b272db6cbf49aa8a1207c8d9fb87
SHA256

85b53edb2e3476bdb29f98bd19c56baa0205e6620917e654cbe81c9745d6193d
SHA512

0e7d3dbe68de4301501df68b1eeb36bf68ca3ea61091710352f68f09f8f9b8b96888ccb2419330b2fbd7b592bd98b583aaea818345c87d591b9b0a96845b8d87
SSDEEP

768:65h+QW4yKs5INTjabOSQwrPG12nFb5GnVWs6k:63XWNKQ2jnSQyNnFbgN

Score

10^/10

mountlocker ransomware

Malware Config

Signatures

MountLocker Ransomware
Ransomware family first seen in late 2020, which threatens to leak files if ransom is not paid.
ransomware mountlocker
Enumerates connected drives 3 TTPs 1 IoCs
Attempts to read the root path of hard drives other than the default C: drive.

Query Registry
T1012

Peripheral Device Discovery
T1120

System Information Discovery
T1082

Processes:

rundll32.exe

description ioc process

File opened (read-only) \??\f: rundll32.exe
Drops file in Program Files directory 2 IoCs

Processes:

rundll32.exe

description ioc process

File created \??\c:\Program Files\RecoveryManual.html rundll32.exe
File created \??\c:\Program Files (x86)\RecoveryManual.html rundll32.exe

description	ioc	process
File opened (read-only)	\??\f:	rundll32.exe

description	ioc	process
File created	\??\c:\Program Files\RecoveryManual.html	rundll32.exe
File created	\??\c:\Program Files (x86)\RecoveryManual.html	rundll32.exe

Modifies registry class 5 IoCs

Processes:

rundll32.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-557049126-2506969350-2798870634-1000_Classes\.F30D4911\shell\Open\command	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-557049126-2506969350-2798870634-1000_Classes\.F30D4911	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-557049126-2506969350-2798870634-1000_Classes\.F30D4911\shell	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-557049126-2506969350-2798870634-1000_Classes\.F30D4911\shell\Open	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-557049126-2506969350-2798870634-1000_Classes\.F30D4911\shell\Open\command\ = "explorer.exe RecoveryManual.html"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

rundll32.exe

pid process

4320 rundll32.exe
4320 rundll32.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

rundll32.exe

description pid process

Token: SeRestorePrivilege 4320 rundll32.exe
Token: SeDebugPrivilege 4320 rundll32.exe

pid	process
4320	rundll32.exe
4320	rundll32.exe

description	pid	process
Token: SeRestorePrivilege	4320	rundll32.exe
Token: SeDebugPrivilege	4320	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

rundll32.exe

description	pid	process	target process
PID 3004 wrote to memory of 4320	3004	rundll32.exe	rundll32.exe
PID 3004 wrote to memory of 4320	3004	rundll32.exe	rundll32.exe
PID 3004 wrote to memory of 4320	3004	rundll32.exe	rundll32.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\ed6e7169456ef1f41f6a45812dda7d98_JaffaCakes118.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3004

C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\ed6e7169456ef1f41f6a45812dda7d98_JaffaCakes118.dll,#1
2⤵
- Enumerates connected drives
- Drops file in Program Files directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4320

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Recovery\WindowsRE\RecoveryManual.html
Filesize
2KB

MD5
59abc02f56079701be867faa7d8b248a

SHA1
df3c0773e44f091e9da442e2df6afb5c143b238e

SHA256
aef108a215d5d14845c893b685a50bdff740be593660d10396894ec5a30e3a60

SHA512
756d9296b57661143ca5950ba96dec6099cdfb79dd7f52f9368d42affa13058c0830af2ff5ef3b8589a9d411502eb0a3590ff6450fe65fe1a3e5a04652785629

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