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
615s
max time network
1607s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-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

Drops desktop.ini file(s) 24 IoCs

Processes:

rundll32.exe

description	ioc	process
File opened for modification	\??\c:\Users\Admin\Desktop\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\AccountPictures\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Downloads\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Videos\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Links\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Saved Games\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Documents\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Desktop\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Music\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Documents\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Downloads\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Pictures\Camera Roll\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Searches\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Videos\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Pictures\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Pictures\Saved Pictures\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Libraries\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Contacts\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Favorites\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Favorites\Links\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Music\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\OneDrive\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Pictures\desktop.ini	rundll32.exe

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

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

Modifies registry class 5 IoCs

Processes:

rundll32.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3727096518-2913484142-3593445157-1000_Classes\.F30D4911\shell\Open\command	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3727096518-2913484142-3593445157-1000_Classes\.F30D4911	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3727096518-2913484142-3593445157-1000_Classes\.F30D4911\shell	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3727096518-2913484142-3593445157-1000_Classes\.F30D4911\shell\Open	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3727096518-2913484142-3593445157-1000_Classes\.F30D4911\shell\Open\command\ = "explorer.exe RecoveryManual.html"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

rundll32.exe

pid process

2004 rundll32.exe
2004 rundll32.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

rundll32.exe

description pid process

Token: SeRestorePrivilege 2004 rundll32.exe
Token: SeDebugPrivilege 2004 rundll32.exe

pid	process
2004	rundll32.exe
2004	rundll32.exe

description	pid	process
Token: SeRestorePrivilege	2004	rundll32.exe
Token: SeDebugPrivilege	2004	rundll32.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

rundll32.exerundll32.execmd.exe

description	pid	process	target process
PID 3096 wrote to memory of 2004	3096	rundll32.exe	rundll32.exe
PID 3096 wrote to memory of 2004	3096	rundll32.exe	rundll32.exe
PID 3096 wrote to memory of 2004	3096	rundll32.exe	rundll32.exe
PID 2004 wrote to memory of 820	2004	rundll32.exe	cmd.exe
PID 2004 wrote to memory of 820	2004	rundll32.exe	cmd.exe
PID 2004 wrote to memory of 820	2004	rundll32.exe	cmd.exe
PID 820 wrote to memory of 2812	820	cmd.exe	attrib.exe
PID 820 wrote to memory of 2812	820	cmd.exe	attrib.exe
PID 820 wrote to memory of 2812	820	cmd.exe	attrib.exe

Views/modifies file attributes 1 TTPs 1 IoCs
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exe

pid process

2812 attrib.exe

pid	process
2812	attrib.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\ed6e7169456ef1f41f6a45812dda7d98_JaffaCakes118.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3096
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\ed6e7169456ef1f41f6a45812dda7d98_JaffaCakes118.dll,#1
  2⤵
  - Drops desktop.ini file(s)
  - Enumerates connected drives
  - Drops file in Program Files directory
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2004
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\\0E57B71B.bat" "C:\Users\Admin\AppData\Local\Temp\ed6e7169456ef1f41f6a45812dda7d98_JaffaCakes118.dll""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:820
  - - C:\Windows\SysWOW64\attrib.exe
      attrib -s -r -h "C:\Users\Admin\AppData\Local\Temp\ed6e7169456ef1f41f6a45812dda7d98_JaffaCakes118.dll"
      4⤵
      Views/modifies file attributes
      PID:2812

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\RecoveryManual.html

Filesize
2KB

MD5
72e6685fe8612512c4daceb2930e7b9f

SHA1
75619d4b0fcfcfd346e1235eb53b5e07e9a2564c

SHA256
5bc9167f5792de8898bf74997c1528b400d5314e1e4cb2532b94d5bd432d767c

SHA512
d3478e99fc1cd336ddc2688d8d60b07b909bb407c1d97b0d85de5576f0785c1a465fc03776293726d54d07a35319ed55cc8a65f5ca684ae3cb9deaf90075c6cd

Download Submit
C:\Users\Admin\AppData\Local\Temp\0E57B71B.bat

Filesize
65B

MD5
348cae913e496198548854f5ff2f6d1e

SHA1
a07655b9020205bd47084afd62a8bb22b48c0cdc

SHA256
c80128f51871eec3ae2057989a025ce244277c1c180498a5aaef45d5214b8506

SHA512
799796736d41d3fcb5a7c859571bb025ca2d062c4b86e078302be68c1a932ed4f78e003640df5405274364b5a9a9c0ba5e37177997683ee7ab54e5267590b611

Download Submit