medusalocker | add2850732c42683ee92ba555bbffb88bf5a4eee7c51e24f15a898f2d5aff66b

General

Target

LFm.bin.exe
Size

678KB
MD5

168447d837fc71deeee9f6c15e22d4f4
SHA1

80ad29680cb8cecf58d870ee675b155fc616097f
SHA256

add2850732c42683ee92ba555bbffb88bf5a4eee7c51e24f15a898f2d5aff66b
SHA512

f8e123b601b5df3e89109fcc2e215e014b0d99b382d7cfb1a8cfd55790525c4e5504ee668ac30108c1bebf32e312e0c33edb5737c7ae166b59f791269bd66112
SSDEEP

12288:cPJ4U1TYQivI2qZ7aSgLwkFVpzUvest4ZEbjJLuDJVoM7:J6TYVQ2qZ7aSgLwuVfstRJLIYM

Score

10^/10

medusalocker evasion ransomware spyware stealer trojan

Malware Config

Signatures

MedusaLocker
Ransomware with several variants first seen in September 2019.
ransomware medusalocker

MedusaLocker payload 2 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\svhost.exe	family_medusalocker
C:\Users\Admin\AppData\Roaming\svhost.exe	family_medusalocker

UAC bypass 3 TTPs 2 IoCs

evasion trojan

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

LFm.bin.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	LFm.bin.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	LFm.bin.exe

Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

Modifies extensions of user files 5 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

LFm.bin.exe

description	ioc	process
File renamed	C:\Users\Admin\Pictures\CopyFormat.crw => C:\Users\Admin\Pictures\CopyFormat.crw.lockfiles	LFm.bin.exe
File renamed	C:\Users\Admin\Pictures\HideNew.raw => C:\Users\Admin\Pictures\HideNew.raw.lockfiles	LFm.bin.exe
File opened for modification	C:\Users\Admin\Pictures\SyncPush.tiff	LFm.bin.exe
File renamed	C:\Users\Admin\Pictures\SyncPush.tiff => C:\Users\Admin\Pictures\SyncPush.tiff.lockfiles	LFm.bin.exe
File renamed	C:\Users\Admin\Pictures\UninstallMerge.raw => C:\Users\Admin\Pictures\UninstallMerge.raw.lockfiles	LFm.bin.exe

Executes dropped EXE 1 IoCs

Processes:

svhost.exe

pid process

2040 svhost.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

LFm.bin.exe

description ioc process

Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" LFm.bin.exe
Drops desktop.ini file(s) 1 IoCs

Processes:

LFm.bin.exe

description ioc process

File opened for modification \??\Z:\$RECYCLE.BIN\S-1-5-21-3948302646-268491222-1934009652-1000\desktop.ini LFm.bin.exe

pid	process
2040	svhost.exe

description	ioc	process
File opened for modification	\??\Z:\$RECYCLE.BIN\S-1-5-21-3948302646-268491222-1934009652-1000\desktop.ini	LFm.bin.exe

Enumerates connected drives 3 TTPs 24 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:

LFm.bin.exe

description	ioc	process
File opened (read-only)	\??\J:	LFm.bin.exe
File opened (read-only)	\??\K:	LFm.bin.exe
File opened (read-only)	\??\P:	LFm.bin.exe
File opened (read-only)	\??\Q:	LFm.bin.exe
File opened (read-only)	\??\W:	LFm.bin.exe
File opened (read-only)	\??\X:	LFm.bin.exe
File opened (read-only)	\??\G:	LFm.bin.exe
File opened (read-only)	\??\I:	LFm.bin.exe
File opened (read-only)	\??\Y:	LFm.bin.exe
File opened (read-only)	\??\L:	LFm.bin.exe
File opened (read-only)	\??\V:	LFm.bin.exe
File opened (read-only)	\??\B:	LFm.bin.exe
File opened (read-only)	\??\H:	LFm.bin.exe
File opened (read-only)	\??\N:	LFm.bin.exe
File opened (read-only)	\??\R:	LFm.bin.exe
File opened (read-only)	\??\E:	LFm.bin.exe
File opened (read-only)	\??\F:	LFm.bin.exe
File opened (read-only)	\??\O:	LFm.bin.exe
File opened (read-only)	\??\S:	LFm.bin.exe
File opened (read-only)	\??\T:	LFm.bin.exe
File opened (read-only)	\??\U:	LFm.bin.exe
File opened (read-only)	\??\Z:	LFm.bin.exe
File opened (read-only)	\??\A:	LFm.bin.exe
File opened (read-only)	\??\M:	LFm.bin.exe

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

System Information Discovery
T1082
Interacts with shadow copies 2 TTPs 3 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

Processes:

vssadmin.exevssadmin.exevssadmin.exe

pid process

1656 vssadmin.exe
1824 vssadmin.exe
1012 vssadmin.exe

pid	process
1656	vssadmin.exe
1824	vssadmin.exe
1012	vssadmin.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

LFm.bin.exe

pid	process
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe
836	LFm.bin.exe

Suspicious use of AdjustPrivilegeToken 63 IoCs

Processes:

vssvc.exewmic.exewmic.exewmic.exe

description	pid	process
Token: SeBackupPrivilege	700	vssvc.exe
Token: SeRestorePrivilege	700	vssvc.exe
Token: SeAuditPrivilege	700	vssvc.exe
Token: SeIncreaseQuotaPrivilege	1888	wmic.exe
Token: SeSecurityPrivilege	1888	wmic.exe
Token: SeTakeOwnershipPrivilege	1888	wmic.exe
Token: SeLoadDriverPrivilege	1888	wmic.exe
Token: SeSystemProfilePrivilege	1888	wmic.exe
Token: SeSystemtimePrivilege	1888	wmic.exe
Token: SeProfSingleProcessPrivilege	1888	wmic.exe
Token: SeIncBasePriorityPrivilege	1888	wmic.exe
Token: SeCreatePagefilePrivilege	1888	wmic.exe
Token: SeBackupPrivilege	1888	wmic.exe
Token: SeRestorePrivilege	1888	wmic.exe
Token: SeShutdownPrivilege	1888	wmic.exe
Token: SeDebugPrivilege	1888	wmic.exe
Token: SeSystemEnvironmentPrivilege	1888	wmic.exe
Token: SeRemoteShutdownPrivilege	1888	wmic.exe
Token: SeUndockPrivilege	1888	wmic.exe
Token: SeManageVolumePrivilege	1888	wmic.exe
Token: 33	1888	wmic.exe
Token: 34	1888	wmic.exe
Token: 35	1888	wmic.exe
Token: SeIncreaseQuotaPrivilege	1560	wmic.exe
Token: SeSecurityPrivilege	1560	wmic.exe
Token: SeTakeOwnershipPrivilege	1560	wmic.exe
Token: SeLoadDriverPrivilege	1560	wmic.exe
Token: SeSystemProfilePrivilege	1560	wmic.exe
Token: SeSystemtimePrivilege	1560	wmic.exe
Token: SeProfSingleProcessPrivilege	1560	wmic.exe
Token: SeIncBasePriorityPrivilege	1560	wmic.exe
Token: SeCreatePagefilePrivilege	1560	wmic.exe
Token: SeBackupPrivilege	1560	wmic.exe
Token: SeRestorePrivilege	1560	wmic.exe
Token: SeShutdownPrivilege	1560	wmic.exe
Token: SeDebugPrivilege	1560	wmic.exe
Token: SeSystemEnvironmentPrivilege	1560	wmic.exe
Token: SeRemoteShutdownPrivilege	1560	wmic.exe
Token: SeUndockPrivilege	1560	wmic.exe
Token: SeManageVolumePrivilege	1560	wmic.exe
Token: 33	1560	wmic.exe
Token: 34	1560	wmic.exe
Token: 35	1560	wmic.exe
Token: SeIncreaseQuotaPrivilege	1716	wmic.exe
Token: SeSecurityPrivilege	1716	wmic.exe
Token: SeTakeOwnershipPrivilege	1716	wmic.exe
Token: SeLoadDriverPrivilege	1716	wmic.exe
Token: SeSystemProfilePrivilege	1716	wmic.exe
Token: SeSystemtimePrivilege	1716	wmic.exe
Token: SeProfSingleProcessPrivilege	1716	wmic.exe
Token: SeIncBasePriorityPrivilege	1716	wmic.exe
Token: SeCreatePagefilePrivilege	1716	wmic.exe
Token: SeBackupPrivilege	1716	wmic.exe
Token: SeRestorePrivilege	1716	wmic.exe
Token: SeShutdownPrivilege	1716	wmic.exe
Token: SeDebugPrivilege	1716	wmic.exe
Token: SeSystemEnvironmentPrivilege	1716	wmic.exe
Token: SeRemoteShutdownPrivilege	1716	wmic.exe
Token: SeUndockPrivilege	1716	wmic.exe
Token: SeManageVolumePrivilege	1716	wmic.exe
Token: 33	1716	wmic.exe
Token: 34	1716	wmic.exe
Token: 35	1716	wmic.exe

Suspicious use of WriteProcessMemory 28 IoCs

Processes:

LFm.bin.exetaskeng.exe

description	pid	process	target process
PID 836 wrote to memory of 1656	836	LFm.bin.exe	vssadmin.exe
PID 836 wrote to memory of 1656	836	LFm.bin.exe	vssadmin.exe
PID 836 wrote to memory of 1656	836	LFm.bin.exe	vssadmin.exe
PID 836 wrote to memory of 1656	836	LFm.bin.exe	vssadmin.exe
PID 836 wrote to memory of 1888	836	LFm.bin.exe	wmic.exe
PID 836 wrote to memory of 1888	836	LFm.bin.exe	wmic.exe
PID 836 wrote to memory of 1888	836	LFm.bin.exe	wmic.exe
PID 836 wrote to memory of 1888	836	LFm.bin.exe	wmic.exe
PID 836 wrote to memory of 1824	836	LFm.bin.exe	vssadmin.exe
PID 836 wrote to memory of 1824	836	LFm.bin.exe	vssadmin.exe
PID 836 wrote to memory of 1824	836	LFm.bin.exe	vssadmin.exe
PID 836 wrote to memory of 1824	836	LFm.bin.exe	vssadmin.exe
PID 836 wrote to memory of 1560	836	LFm.bin.exe	wmic.exe
PID 836 wrote to memory of 1560	836	LFm.bin.exe	wmic.exe
PID 836 wrote to memory of 1560	836	LFm.bin.exe	wmic.exe
PID 836 wrote to memory of 1560	836	LFm.bin.exe	wmic.exe
PID 836 wrote to memory of 1012	836	LFm.bin.exe	vssadmin.exe
PID 836 wrote to memory of 1012	836	LFm.bin.exe	vssadmin.exe
PID 836 wrote to memory of 1012	836	LFm.bin.exe	vssadmin.exe
PID 836 wrote to memory of 1012	836	LFm.bin.exe	vssadmin.exe
PID 836 wrote to memory of 1716	836	LFm.bin.exe	wmic.exe
PID 836 wrote to memory of 1716	836	LFm.bin.exe	wmic.exe
PID 836 wrote to memory of 1716	836	LFm.bin.exe	wmic.exe
PID 836 wrote to memory of 1716	836	LFm.bin.exe	wmic.exe
PID 240 wrote to memory of 2040	240	taskeng.exe	svhost.exe
PID 240 wrote to memory of 2040	240	taskeng.exe	svhost.exe
PID 240 wrote to memory of 2040	240	taskeng.exe	svhost.exe
PID 240 wrote to memory of 2040	240	taskeng.exe	svhost.exe

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

Processes:

LFm.bin.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	LFm.bin.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	LFm.bin.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1"	LFm.bin.exe

Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Users\Admin\AppData\Local\Temp\LFm.bin.exe
"C:\Users\Admin\AppData\Local\Temp\LFm.bin.exe"
1⤵
- UAC bypass
- Modifies extensions of user files
- Checks whether UAC is enabled
- Drops desktop.ini file(s)
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- System policy modification
PID:836
- C:\Windows\SysWOW64\vssadmin.exe
  vssadmin.exe Delete Shadows /All /Quiet
  2⤵
  - Interacts with shadow copies
  PID:1656
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1888
- C:\Windows\SysWOW64\vssadmin.exe
  vssadmin.exe Delete Shadows /All /Quiet
  2⤵
  - Interacts with shadow copies
  PID:1824
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1560
- C:\Windows\SysWOW64\vssadmin.exe
  vssadmin.exe Delete Shadows /All /Quiet
  2⤵
  - Interacts with shadow copies
  PID:1012
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1716

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:700

C:\Windows\system32\taskeng.exe
taskeng.exe {C44B8742-E457-4EF4-B874-2215AF2CD23A} S-1-5-21-3948302646-268491222-1934009652-1000:KXZDHPUW\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:240
- C:\Users\Admin\AppData\Roaming\svhost.exe
  C:\Users\Admin\AppData\Roaming\svhost.exe
  2⤵
  - Executes dropped EXE
  PID:2040

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Bypass User Account Control

1

T1088

Defense Evasion

Bypass User Account Control

1

T1088

Disabling Security Tools

File Deletion

Modify Registry

Credential Access

Credentials in Files

1

T1081

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

Inhibit System Recovery

2

T1490

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Downloads

C:\MSOCache\All Users\{90140000-0016-0409-0000-0000000FF1CE}-C\How_to_back_files.html

Filesize
4KB

MD5
e8c5e4b852f080ddb5e1743e193dd2cd

SHA1
926415b3d692163fb7af43566a4f39f618dfa76d

SHA256
b1fc756a209b579d949b7a06817c53f49f1a953be41b543e714e820f5fe7ffd6

SHA512
2b89945d0cadd9221cc17509ed22b5ee584b07935e30d1375e7d3b212458e2698a3a82e05be05165ed03abaf4178e0a79f175837cc599eedc3651b8fa9e98c11

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C:\Users\Admin\AppData\Roaming\svhost.exe

Filesize
678KB

MD5
168447d837fc71deeee9f6c15e22d4f4

SHA1
80ad29680cb8cecf58d870ee675b155fc616097f

SHA256
add2850732c42683ee92ba555bbffb88bf5a4eee7c51e24f15a898f2d5aff66b

SHA512
f8e123b601b5df3e89109fcc2e215e014b0d99b382d7cfb1a8cfd55790525c4e5504ee668ac30108c1bebf32e312e0c33edb5737c7ae166b59f791269bd66112

Download Submit
C:\Users\Admin\AppData\Roaming\svhost.exe

Filesize
678KB

MD5
168447d837fc71deeee9f6c15e22d4f4

SHA1
80ad29680cb8cecf58d870ee675b155fc616097f

SHA256
add2850732c42683ee92ba555bbffb88bf5a4eee7c51e24f15a898f2d5aff66b

SHA512
f8e123b601b5df3e89109fcc2e215e014b0d99b382d7cfb1a8cfd55790525c4e5504ee668ac30108c1bebf32e312e0c33edb5737c7ae166b59f791269bd66112

Download Submit
C:\Users\Default\NTUSER.DAT.LOG2

Filesize
536B

MD5
195ede311eedd742757ac03546a0e985

SHA1
bf24cb5b88ca114f8eb61da7d775b3a758a6bf73

SHA256
8fc973451d3f0030f0017e3c095bec057105382a2e7586cd8269b5619c9c5115

SHA512
a1d00316d4599a7fe81a569a127d7498af13f296d3c5989dc62eb2c326ef755c0de9160018c66cc6a2aa361ebc9cd2ae264cbb0f60c83d0eaf79ab9ba3c17b49

Download Submit

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads