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

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\ExportRead.png => C:\Users\Admin\Pictures\ExportRead.png.lockfiles	LFm.bin.exe
File renamed	C:\Users\Admin\Pictures\InitializeUpdate.crw => C:\Users\Admin\Pictures\InitializeUpdate.crw.lockfiles	LFm.bin.exe
File renamed	C:\Users\Admin\Pictures\RestartPop.crw => C:\Users\Admin\Pictures\RestartPop.crw.lockfiles	LFm.bin.exe
File opened for modification	C:\Users\Admin\Pictures\UnprotectStart.tiff	LFm.bin.exe
File renamed	C:\Users\Admin\Pictures\UnprotectStart.tiff => C:\Users\Admin\Pictures\UnprotectStart.tiff.lockfiles	LFm.bin.exe

Executes dropped EXE 1 IoCs

Processes:

svhost.exe

pid process

444 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-1-5-21-1013461898-3711306144-4198452673-1000\desktop.ini LFm.bin.exe

pid	process
444	svhost.exe

description	ioc	process
File opened for modification	\??\Z:\$RECYCLE.BIN\S-1-5-21-1013461898-3711306144-4198452673-1000\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)	\??\B:	LFm.bin.exe
File opened (read-only)	\??\J:	LFm.bin.exe
File opened (read-only)	\??\L:	LFm.bin.exe
File opened (read-only)	\??\Q:	LFm.bin.exe
File opened (read-only)	\??\U:	LFm.bin.exe
File opened (read-only)	\??\W:	LFm.bin.exe
File opened (read-only)	\??\I:	LFm.bin.exe
File opened (read-only)	\??\K:	LFm.bin.exe
File opened (read-only)	\??\P:	LFm.bin.exe
File opened (read-only)	\??\R:	LFm.bin.exe
File opened (read-only)	\??\S:	LFm.bin.exe
File opened (read-only)	\??\V:	LFm.bin.exe
File opened (read-only)	\??\A:	LFm.bin.exe
File opened (read-only)	\??\N:	LFm.bin.exe
File opened (read-only)	\??\Y:	LFm.bin.exe
File opened (read-only)	\??\Z:	LFm.bin.exe
File opened (read-only)	\??\T:	LFm.bin.exe
File opened (read-only)	\??\X:	LFm.bin.exe
File opened (read-only)	\??\E:	LFm.bin.exe
File opened (read-only)	\??\F:	LFm.bin.exe
File opened (read-only)	\??\G:	LFm.bin.exe
File opened (read-only)	\??\H:	LFm.bin.exe
File opened (read-only)	\??\M:	LFm.bin.exe
File opened (read-only)	\??\O:	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

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

LFm.bin.exe

pid	process
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe
5028	LFm.bin.exe

Suspicious use of AdjustPrivilegeToken 63 IoCs

Processes:

wmic.exewmic.exewmic.exe

description	pid	process
Token: SeIncreaseQuotaPrivilege	2040	wmic.exe
Token: SeSecurityPrivilege	2040	wmic.exe
Token: SeTakeOwnershipPrivilege	2040	wmic.exe
Token: SeLoadDriverPrivilege	2040	wmic.exe
Token: SeSystemProfilePrivilege	2040	wmic.exe
Token: SeSystemtimePrivilege	2040	wmic.exe
Token: SeProfSingleProcessPrivilege	2040	wmic.exe
Token: SeIncBasePriorityPrivilege	2040	wmic.exe
Token: SeCreatePagefilePrivilege	2040	wmic.exe
Token: SeBackupPrivilege	2040	wmic.exe
Token: SeRestorePrivilege	2040	wmic.exe
Token: SeShutdownPrivilege	2040	wmic.exe
Token: SeDebugPrivilege	2040	wmic.exe
Token: SeSystemEnvironmentPrivilege	2040	wmic.exe
Token: SeRemoteShutdownPrivilege	2040	wmic.exe
Token: SeUndockPrivilege	2040	wmic.exe
Token: SeManageVolumePrivilege	2040	wmic.exe
Token: 33	2040	wmic.exe
Token: 34	2040	wmic.exe
Token: 35	2040	wmic.exe
Token: 36	2040	wmic.exe
Token: SeIncreaseQuotaPrivilege	208	wmic.exe
Token: SeSecurityPrivilege	208	wmic.exe
Token: SeTakeOwnershipPrivilege	208	wmic.exe
Token: SeLoadDriverPrivilege	208	wmic.exe
Token: SeSystemProfilePrivilege	208	wmic.exe
Token: SeSystemtimePrivilege	208	wmic.exe
Token: SeProfSingleProcessPrivilege	208	wmic.exe
Token: SeIncBasePriorityPrivilege	208	wmic.exe
Token: SeCreatePagefilePrivilege	208	wmic.exe
Token: SeBackupPrivilege	208	wmic.exe
Token: SeRestorePrivilege	208	wmic.exe
Token: SeShutdownPrivilege	208	wmic.exe
Token: SeDebugPrivilege	208	wmic.exe
Token: SeSystemEnvironmentPrivilege	208	wmic.exe
Token: SeRemoteShutdownPrivilege	208	wmic.exe
Token: SeUndockPrivilege	208	wmic.exe
Token: SeManageVolumePrivilege	208	wmic.exe
Token: 33	208	wmic.exe
Token: 34	208	wmic.exe
Token: 35	208	wmic.exe
Token: 36	208	wmic.exe
Token: SeIncreaseQuotaPrivilege	3364	wmic.exe
Token: SeSecurityPrivilege	3364	wmic.exe
Token: SeTakeOwnershipPrivilege	3364	wmic.exe
Token: SeLoadDriverPrivilege	3364	wmic.exe
Token: SeSystemProfilePrivilege	3364	wmic.exe
Token: SeSystemtimePrivilege	3364	wmic.exe
Token: SeProfSingleProcessPrivilege	3364	wmic.exe
Token: SeIncBasePriorityPrivilege	3364	wmic.exe
Token: SeCreatePagefilePrivilege	3364	wmic.exe
Token: SeBackupPrivilege	3364	wmic.exe
Token: SeRestorePrivilege	3364	wmic.exe
Token: SeShutdownPrivilege	3364	wmic.exe
Token: SeDebugPrivilege	3364	wmic.exe
Token: SeSystemEnvironmentPrivilege	3364	wmic.exe
Token: SeRemoteShutdownPrivilege	3364	wmic.exe
Token: SeUndockPrivilege	3364	wmic.exe
Token: SeManageVolumePrivilege	3364	wmic.exe
Token: 33	3364	wmic.exe
Token: 34	3364	wmic.exe
Token: 35	3364	wmic.exe
Token: 36	3364	wmic.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

LFm.bin.exe

description	pid	process	target process
PID 5028 wrote to memory of 2040	5028	LFm.bin.exe	wmic.exe
PID 5028 wrote to memory of 2040	5028	LFm.bin.exe	wmic.exe
PID 5028 wrote to memory of 2040	5028	LFm.bin.exe	wmic.exe
PID 5028 wrote to memory of 208	5028	LFm.bin.exe	wmic.exe
PID 5028 wrote to memory of 208	5028	LFm.bin.exe	wmic.exe
PID 5028 wrote to memory of 208	5028	LFm.bin.exe	wmic.exe
PID 5028 wrote to memory of 3364	5028	LFm.bin.exe	wmic.exe
PID 5028 wrote to memory of 3364	5028	LFm.bin.exe	wmic.exe
PID 5028 wrote to memory of 3364	5028	LFm.bin.exe	wmic.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

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:5028
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2040
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:208
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3364

C:\Users\Admin\AppData\Roaming\svhost.exe
C:\Users\Admin\AppData\Roaming\svhost.exe
1⤵
- Executes dropped EXE
PID:444

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

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

Replay Monitor

Loading Replay Monitor...

Downloads

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
3454c8ebf2f69aff22ec8694557b08f7

SHA1
a82defe86d5f9b5d43ae37bcce457fef5a800cdb

SHA256
830d5b5c2537d68713e630bd284f4edfaf230afde5cc19bf8923d59431768a19

SHA512
853d688e5369958c3095511663fe59061d22dc3e568adc8b38ea54fdfa973a782eed435bd2b57a31dbfeb0d0e9a00af429c8d7b3a562aafbd762488d018fa467

Download Submit
\Device\HarddiskVolume1\Boot\How_to_back_files.html

Filesize
4KB

MD5
f61437405a97e628a2bbed647ebd2a01

SHA1
9002bb4b6ebb808ea6738dc7f471a535472e22a9

SHA256
dc46a10dab1dc7287224e2f647a33d6dd8990839f2b3ea103d8328fd1aa00981

SHA512
a94b34d9e0d642bb98e0e76dbed9f9350f420f24ab753735f8d16f075c919bd1e5b146fc1f47c709be0f3c9a457a580dd5804784bc799a257ce9423fe4189ffc

Download Submit

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads