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
120s
max time network
120s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
11-04-2024 12:33

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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

Deletes itself 1 IoCs

pid	Process
1188	cmd.exe

Drops desktop.ini file(s) 32 IoCs

description	ioc	Process
File opened for modification	\??\c:\Users\Public\Libraries\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\EQ2PZD61\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\JWM3U1DD\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Saved Games\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Music\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Pictures\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Recorded TV\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\AppData\Local\Microsoft\Windows Mail\Stationery\Desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Downloads\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Favorites\Links\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Searches\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\Recorded TV\Sample Media\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Videos\Sample Videos\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Links\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Music\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Videos\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Pictures\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Documents\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\2RM92H5V\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Documents\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 for United States\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Downloads\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Desktop\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Videos\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Music\Sample Music\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Public\Pictures\Sample Pictures\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\BB4W7M7Z\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\desktop.ini	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Contacts\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

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

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File created	\??\c:\Program Files\RecoveryManual.html	rundll32.exe
File created	\??\c:\Program Files (x86)\RecoveryManual.html	rundll32.exe
File created	\??\c:\Program Files (x86)\Microsoft SQL Server Compact Edition\v3.5\RecoveryManual.html	rundll32.exe

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_CLASSES\.F30D4911\shell\Open\command	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_CLASSES\.F30D4911	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_CLASSES\.F30D4911\shell	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_CLASSES\.F30D4911\shell\Open	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1298544033-3225604241-2703760938-1000_CLASSES\.F30D4911\shell\Open\command\ = "explorer.exe RecoveryManual.html"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2184	rundll32.exe
2184	rundll32.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeRestorePrivilege	2184	rundll32.exe
Token: SeDebugPrivilege	2184	rundll32.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1924 wrote to memory of 2184	1924	rundll32.exe	28
PID 1924 wrote to memory of 2184	1924	rundll32.exe	28
PID 1924 wrote to memory of 2184	1924	rundll32.exe	28
PID 1924 wrote to memory of 2184	1924	rundll32.exe	28
PID 1924 wrote to memory of 2184	1924	rundll32.exe	28
PID 1924 wrote to memory of 2184	1924	rundll32.exe	28
PID 1924 wrote to memory of 2184	1924	rundll32.exe	28
PID 2184 wrote to memory of 1188	2184	rundll32.exe	30
PID 2184 wrote to memory of 1188	2184	rundll32.exe	30
PID 2184 wrote to memory of 1188	2184	rundll32.exe	30
PID 2184 wrote to memory of 1188	2184	rundll32.exe	30
PID 1188 wrote to memory of 2028	1188	cmd.exe	32
PID 1188 wrote to memory of 2028	1188	cmd.exe	32
PID 1188 wrote to memory of 2028	1188	cmd.exe	32
PID 1188 wrote to memory of 2028	1188	cmd.exe	32

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2028	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:1924
- 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:2184
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\\0F763FAF.bat" "C:\Users\Admin\AppData\Local\Temp\ed6e7169456ef1f41f6a45812dda7d98_JaffaCakes118.dll""
    3⤵
    - Deletes itself
    - Suspicious use of WriteProcessMemory
    PID:1188
  - - C:\Windows\SysWOW64\attrib.exe
      attrib -s -r -h "C:\Users\Admin\AppData\Local\Temp\ed6e7169456ef1f41f6a45812dda7d98_JaffaCakes118.dll"
      4⤵
      Views/modifies file attributes
      PID:2028

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:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\RecoveryManual.html

Filesize
2KB

MD5
c05a2821a9fc97a54568466d95a4ad92

SHA1
f74925d9af5d063e61903d9856527c00911571d1

SHA256
530af8a0154f6c632ccf0982ee8f22060bd8e3b3c66f38b9a7155a89b7a0e333

SHA512
9a35b2cc667444f63491bfc5e69b1178e0137c64247358295c3abf136c0489aaa3480ba8a9afec4f3618ffec6ca20b63c0bd8782905bffe866251640038b1964

Download Submit
C:\Users\Admin\AppData\Local\Temp\0F763FAF.bat

Filesize
65B

MD5
348cae913e496198548854f5ff2f6d1e

SHA1
a07655b9020205bd47084afd62a8bb22b48c0cdc

SHA256
c80128f51871eec3ae2057989a025ce244277c1c180498a5aaef45d5214b8506

SHA512
799796736d41d3fcb5a7c859571bb025ca2d062c4b86e078302be68c1a932ed4f78e003640df5405274364b5a9a9c0ba5e37177997683ee7ab54e5267590b611

Download Submit