mountlocker | 8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81

General

Target

8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
Size

47KB
MD5

1089e51d09d2faa1956fd04bbbb4c6b4
SHA1

e40944f5a2924a0b9ead8fdebd058755e35cde0b
SHA256

8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81
SHA512

eb1b62d9ad8489a1037edb99b4dbb64300d8c7ec7e9b015139db35107716f946ab4ebadaef696b63e116a5ee9bd451dd164a4cce376959d1cefe6c5ccff4fce1

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

Modifies extensions of user files 9 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe

description	ioc	process
File opened for modification	\??\c:\Users\Admin\Pictures\InvokeSearch.tiff	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Admin\Pictures\BackupAdd.tiff	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File renamed	C:\Users\Admin\Pictures\DebugTrace.png => \??\c:\Users\Admin\Pictures\DebugTrace.png.ReadManual.1DB16BB9	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File renamed	C:\Users\Admin\Pictures\GrantUndo.raw => \??\c:\Users\Admin\Pictures\GrantUndo.raw.ReadManual.1DB16BB9	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File renamed	C:\Users\Admin\Pictures\InvokeSearch.tiff => \??\c:\Users\Admin\Pictures\InvokeSearch.tiff.ReadManual.1DB16BB9	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File renamed	C:\Users\Admin\Pictures\RedoTrace.png => \??\c:\Users\Admin\Pictures\RedoTrace.png.ReadManual.1DB16BB9	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File renamed	C:\Users\Admin\Pictures\RestartDisable.tif => \??\c:\Users\Admin\Pictures\RestartDisable.tif.ReadManual.1DB16BB9	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File renamed	C:\Users\Admin\Pictures\AssertOptimize.png => \??\c:\Users\Admin\Pictures\AssertOptimize.png.ReadManual.1DB16BB9	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File renamed	C:\Users\Admin\Pictures\BackupAdd.tiff => \??\c:\Users\Admin\Pictures\BackupAdd.tiff.ReadManual.1DB16BB9	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe

Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

1544 cmd.exe

pid	process
1544	cmd.exe

Drops desktop.ini file(s) 26 IoCs

Processes:

8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe

description	ioc	process
File opened for modification	\??\c:\Users\Admin\Music\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Admin\Searches\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Public\Desktop\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Public\Pictures\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Admin\Desktop\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Admin\Documents\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Admin\Downloads\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Admin\Favorites\Links\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Public\Recorded TV\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Public\Videos\Sample Videos\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Public\Music\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Public\Music\Sample Music\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Public\Pictures\Sample Pictures\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Public\Recorded TV\Sample Media\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Admin\Contacts\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Admin\Links\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Admin\Pictures\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Public\Libraries\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Public\Videos\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Admin\Favorites\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Public\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Public\Documents\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Public\Downloads\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Admin\Favorites\Links for United States\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Admin\Saved Games\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File opened for modification	\??\c:\Users\Admin\Videos\desktop.ini	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe

Drops file in Program Files directory 3 IoCs

Processes:

8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe

description	ioc	process
File created	\??\c:\Program Files\RecoveryManual.html	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File created	\??\c:\Program Files (x86)\RecoveryManual.html	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
File created	\??\c:\Program Files (x86)\Microsoft SQL Server Compact Edition\v3.5\RecoveryManual.html	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe

Modifies registry class 5 IoCs

Processes:

8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000_CLASSES\.1DB16BB9\shell\Open	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000_CLASSES\.1DB16BB9\shell\Open\command\ = "explorer.exe RecoveryManual.html"	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000_CLASSES\.1DB16BB9\shell\Open\command	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000_CLASSES\.1DB16BB9	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000_CLASSES\.1DB16BB9\shell	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe

pid	process
1116	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
1116	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe

description pid process

Token: SeRestorePrivilege 1116 8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe

description	pid	process
Token: SeRestorePrivilege	1116	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.execmd.exe

description	pid	process	target process
PID 1116 wrote to memory of 1544	1116	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe	cmd.exe
PID 1116 wrote to memory of 1544	1116	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe	cmd.exe
PID 1116 wrote to memory of 1544	1116	8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe	cmd.exe
PID 1544 wrote to memory of 332	1544	cmd.exe	attrib.exe
PID 1544 wrote to memory of 332	1544	cmd.exe	attrib.exe
PID 1544 wrote to memory of 332	1544	cmd.exe	attrib.exe

Views/modifies file attributes 1 TTPs 1 IoCs
evasion

Hidden Files and Directories
T1158

Processes:

attrib.exe

pid process

332 attrib.exe

pid	process
332	attrib.exe

C:\Users\Admin\AppData\Local\Temp\8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe
"C:\Users\Admin\AppData\Local\Temp\8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe"
1⤵
- Modifies extensions of user files
- Drops desktop.ini file(s)
- Drops file in Program Files directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1116
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\\0F744AF5.bat" "C:\Users\Admin\AppData\Local\Temp\8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe""
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:1544
- - C:\Windows\system32\attrib.exe
    attrib -s -r -h "C:\Users\Admin\AppData\Local\Temp\8b539f3ba05fe82c4f992ffbeb6ab55151b36dce2d03b64721e966dedf82be81.bin.exe"
    3⤵
    - Views/modifies file attributes
    PID:332

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Hidden Files and Directories

1

T1158

Privilege Escalation

Defense Evasion

Hidden Files and Directories

1

T1158

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\0F744AF5.bat

MD5
348cae913e496198548854f5ff2f6d1e

SHA1
a07655b9020205bd47084afd62a8bb22b48c0cdc

SHA256
c80128f51871eec3ae2057989a025ce244277c1c180498a5aaef45d5214b8506

SHA512
799796736d41d3fcb5a7c859571bb025ca2d062c4b86e078302be68c1a932ed4f78e003640df5405274364b5a9a9c0ba5e37177997683ee7ab54e5267590b611

Download Submit
memory/332-62-0x0000000000000000-mapping.dmp

Download
memory/1544-60-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads