stealerium | 5f2b46e3cfb853b3be645309ea8378f6535bf7128e0794ff9ab2ef0972554e8a

General

Target

Lmfekeldirxz.exe
Size

3.0MB
MD5

0372cb4f806947727400d1937f3e8063
SHA1

89aee134a5226e103f702f434a059c601eebf336
SHA256

5f2b46e3cfb853b3be645309ea8378f6535bf7128e0794ff9ab2ef0972554e8a
SHA512

b92f743d4fd4101bee6e6a8becba6be698f36ac83a18b0913bf0bc22d8a0ca57ea1bf659936a9398f729ed6b0f323bb437e6a67b4e0d5a79efba0baadf093fe1
SSDEEP

49152:L2Xg/Wplj7e9IDcaZw1g9cDv1a4TOJMomYJJ8FRmrc:A8Qle9Id4Vha46JMdEJE

Score

10^/10

stealerium bootkit defense_evasion discovery persistence stealer trojan

Malware Config

Extracted

Family

stealerium

C2

https://discord.com/api/webhooks/1038709348303650857/DLQdA51dlH2mWOgr-jjNC0jvu25-oWapgKwxpsqsFwOSYLm4gQOEdFE6XXg7_sReK0AB

Signatures

Stealerium
An open source info stealer written in C# first seen in May 2022.
stealer stealerium
Stealerium family
stealerium

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

defense_evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	Lmfekeldirxz.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	Lmfekeldirxz.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Lmfekeldirxz.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-1-5-21-1479699283-3000499823-2337359760-1000\Control Panel\International\Geo\Nation	Lmfekeldirxz.exe

Identifies Wine through registry keys 2 TTPs 1 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

defense_evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1479699283-3000499823-2337359760-1000\Software\Wine	Lmfekeldirxz.exe

Checks whether UAC is enabled 1 TTPs 1 IoCs

defense_evasion trojan

System Information Discovery

T1082

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

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
30	discord.com
31	discord.com

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
27	ip-api.com

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	Lmfekeldirxz.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
808	Lmfekeldirxz.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	taskkill.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Lmfekeldirxz.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	chcp.com

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
4336	timeout.exe

Kills process with taskkill 1 IoCs

defense_evasion

pid	Process
2112	taskkill.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
808	Lmfekeldirxz.exe
808	Lmfekeldirxz.exe
808	Lmfekeldirxz.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	808	Lmfekeldirxz.exe
Token: SeDebugPrivilege	2112	taskkill.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 808 wrote to memory of 4124	808	Lmfekeldirxz.exe	92
PID 808 wrote to memory of 4124	808	Lmfekeldirxz.exe	92
PID 808 wrote to memory of 4124	808	Lmfekeldirxz.exe	92
PID 4124 wrote to memory of 2572	4124	cmd.exe	94
PID 4124 wrote to memory of 2572	4124	cmd.exe	94
PID 4124 wrote to memory of 2572	4124	cmd.exe	94
PID 4124 wrote to memory of 2112	4124	cmd.exe	95
PID 4124 wrote to memory of 2112	4124	cmd.exe	95
PID 4124 wrote to memory of 2112	4124	cmd.exe	95
PID 4124 wrote to memory of 4336	4124	cmd.exe	96
PID 4124 wrote to memory of 4336	4124	cmd.exe	96
PID 4124 wrote to memory of 4336	4124	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\Lmfekeldirxz.exe
"C:\Users\Admin\AppData\Local\Temp\Lmfekeldirxz.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks computer location settings
- Identifies Wine through registry keys
- Checks whether UAC is enabled
- Writes to the Master Boot Record (MBR)
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:808
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\tmpD69.tmp.bat
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4124
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2572
- - C:\Windows\SysWOW64\taskkill.exe
    TaskKill /F /IM 808
    3⤵
    - System Location Discovery: System Language Discovery
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:2112
- - C:\Windows\SysWOW64\timeout.exe
    Timeout /T 2 /Nobreak
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4336

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Query Registry

4

T1012

System Information Discovery

4

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Virtualization/Sandbox Evasion

2

T1497

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\tmpD69.tmp.bat

Filesize
56B

MD5
9aaae03ffe3e82eeeb63ecaba771218b

SHA1
32f3d73a8b11764ebabbdb27ef5924259f2eaae6

SHA256
8ca296211c7e81c96c4a091939bfdf02fb31387c79125072f010746fa84efec2

SHA512
336a7c34ffd6c2e681f73aacaf907ee7e7ee1df4938bd77feb7fb59c9a8ffcce79075f27b64bc9697af01009c0b0b52d9df12b7fc2000623284ebb34bca811a2

Download Submit
memory/808-0-0x00000000009C0000-0x0000000000ED2000-memory.dmp

Filesize
5.1MB

Download
memory/808-2-0x00000000009C0000-0x0000000000ED2000-memory.dmp

Filesize
5.1MB

Download
memory/808-3-0x00000000009C0000-0x0000000000ED2000-memory.dmp

Filesize
5.1MB

Download
memory/808-4-0x00000000073B0000-0x0000000007416000-memory.dmp

Filesize
408KB

Download
memory/808-6-0x00000000009C0000-0x0000000000ED2000-memory.dmp

Filesize
5.1MB

Download
memory/808-10-0x00000000009C0000-0x0000000000ED2000-memory.dmp

Filesize
5.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads