legionlocker | 9e3e436d4345c5b6f20bc060d766a7ee0c3ea8c4aebee80d0cfe3481515961a1

General

Target

LegionLocker.exe
Size

3.4MB
MD5

ff781960baad7ac1974e254bbc7d8044
SHA1

263450e71b84d608d40448c73add2719875c4732
SHA256

9d13fde85da13d3c9533ace39fdfb71c95419f002c946265e6d12030890d8b9d
SHA512

fc572d058d0c4782621d069cc9d16b575363bdd51a3d50bedc4b91b12c0e6ac6d93256ae9266c5cac17878dd0da474477bc283735e8d4decf206e68150495d8a

Score

10^/10

legionlocker evasion ransomware themida trojan

Malware Config

Signatures

Detected LegionLocker ransomware 2 IoCs

Sample contains strings associated with the LegionLocker family.

ransomware

resource	yara_rule
behavioral2/files/0x000700000001e78d-135.dat	family_legionlocker
behavioral2/files/0x000700000001e78d-136.dat	family_legionlocker

LegionLocker
Ransomware family active in 2021.
ransomware legionlocker
Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Executes dropped EXE 1 IoCs

pid	Process
4580	LegionL0cker.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	LegionL0cker.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	LegionL0cker.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\Control Panel\International\Geo\Nation	LegionLocker.exe

Themida packer 4 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral2/files/0x000700000001e78d-135.dat	themida
behavioral2/files/0x000700000001e78d-136.dat	themida
behavioral2/memory/4580-140-0x0000000000D00000-0x00000000015D4000-memory.dmp	themida
behavioral2/memory/4580-141-0x0000000000D00000-0x00000000015D4000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	LegionL0cker.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
4580	LegionL0cker.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1940 wrote to memory of 4580	1940	LegionLocker.exe	81
PID 1940 wrote to memory of 4580	1940	LegionLocker.exe	81
PID 1940 wrote to memory of 4580	1940	LegionLocker.exe	81

C:\Users\Admin\AppData\Local\Temp\LegionLocker.exe
"C:\Users\Admin\AppData\Local\Temp\LegionLocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1940
- C:\Users\Admin\AppData\Local\Temp\LegionL0cker.exe
  "C:\Users\Admin\AppData\Local\Temp\LegionL0cker.exe"
  2⤵
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Checks whether UAC is enabled
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  PID:4580

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Discovery

Query Registry

3

T1012

System Information Discovery

4

T1082

Virtualization/Sandbox Evasion

1

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1940-130-0x0000000000380000-0x00000000006F0000-memory.dmp

Filesize
3.4MB

Download
memory/1940-131-0x0000000005610000-0x0000000005BB4000-memory.dmp

Filesize
5.6MB

Download
memory/1940-132-0x0000000005100000-0x0000000005192000-memory.dmp

Filesize
584KB

Download
memory/1940-133-0x00000000050A0000-0x00000000050AA000-memory.dmp

Filesize
40KB

Download
memory/1940-134-0x0000000005060000-0x0000000005604000-memory.dmp

Filesize
5.6MB

Download
memory/4580-140-0x0000000000D00000-0x00000000015D4000-memory.dmp

Filesize
8.8MB

Download
memory/4580-141-0x0000000000D00000-0x00000000015D4000-memory.dmp

Filesize
8.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads