5d8ee40cb28292dd3e059ef3b6f4e79af271c7a7827597c7355416787b6cf0ce

General

Target

EFRTHMOFJM.dll
Size

13.8MB
MD5

99341e4d2fee0ae1400866d9d603b1f6
SHA1

6c6fd78580d600677a1c06dbb3c7c71693f4bff2
SHA256

272465dbf0d1c78ba32a92cd3a45876a68acd3cb34c7f7e0065bd2b83080c300
SHA512

83c00d998300f604fe9f576db473f2666f97bf09fd1551df76ccaf5f3b6fd99c1b0b0feabf0f1d2306983594f5b21a11022cf177ffc0341e2589ce900f87d61a
SSDEEP

196608:5RPbnMvO3xOB8/IscBeM0tKhFMHjNEnpOgPHSnZaKC/m1tb32w1Hio/wtvI9OvOQ:jrN/InbfLMpOgR1tJ1F/wBI8Q

Score

9^/10

evasion themida trojan

Malware Config

Signatures

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

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	rundll32.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	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
1704	rundll32.exe

Themida packer 13 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral2/memory/1704-133-0x0000000002030000-0x0000000004443000-memory.dmp	themida
behavioral2/memory/1704-134-0x0000000002030000-0x0000000004443000-memory.dmp	themida
behavioral2/memory/1704-135-0x0000000002030000-0x0000000004443000-memory.dmp	themida
behavioral2/memory/1704-136-0x0000000002030000-0x0000000004443000-memory.dmp	themida
behavioral2/memory/1704-137-0x0000000002030000-0x0000000004443000-memory.dmp	themida
behavioral2/memory/1704-138-0x0000000002030000-0x0000000004443000-memory.dmp	themida
behavioral2/memory/1704-139-0x0000000002030000-0x0000000004443000-memory.dmp	themida
behavioral2/memory/1704-140-0x0000000002030000-0x0000000004443000-memory.dmp	themida
behavioral2/memory/1704-141-0x0000000002030000-0x0000000004443000-memory.dmp	themida
behavioral2/memory/1704-142-0x0000000002030000-0x0000000004443000-memory.dmp	themida
behavioral2/memory/1704-143-0x0000000002030000-0x0000000004443000-memory.dmp	themida
behavioral2/memory/1704-144-0x0000000002030000-0x0000000004443000-memory.dmp	themida
behavioral2/memory/1704-169-0x0000000002030000-0x0000000004443000-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	rundll32.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
1704	rundll32.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
1576	1704	WerFault.exe	84
3032	1704	WerFault.exe	84

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1704	rundll32.exe
1704	rundll32.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4240 wrote to memory of 1704	4240	rundll32.exe	84
PID 4240 wrote to memory of 1704	4240	rundll32.exe	84
PID 4240 wrote to memory of 1704	4240	rundll32.exe	84
PID 1704 wrote to memory of 1576	1704	rundll32.exe	88
PID 1704 wrote to memory of 1576	1704	rundll32.exe	88
PID 1704 wrote to memory of 1576	1704	rundll32.exe	88

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\EFRTHMOFJM.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4240
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\EFRTHMOFJM.dll,#1
  2⤵
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Checks BIOS information in registry
  - Loads dropped DLL
  - Checks whether UAC is enabled
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1704
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1704 -s 780
    3⤵
    - Program crash
    PID:1576
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1704 -s 780
    3⤵
    - Program crash
    PID:3032

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 1704 -ip 1704
1⤵
PID:1060

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Virtualization/Sandbox Evasion

1

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\1f00381b.dll

Filesize
8KB

MD5
d8f4ab8284f0fda871d6834e24bc6f37

SHA1
641948e44a1dcfd0ef68910768eb4b1ea6b49d10

SHA256
c09d0790e550694350b94ca6b077c54f983c135fab8990df5a75462804150912

SHA512
f65a916041846718306567d33273c3d0f41e0b26589cf6db46ec6c788ba0d87a708c94979d3bd0609142badca9e7129690b92169a07dcf7cd8c66698827d2fa0

Download Submit
memory/1704-139-0x0000000002030000-0x0000000004443000-memory.dmp

Filesize
36.1MB

Download
memory/1704-141-0x0000000002030000-0x0000000004443000-memory.dmp

Filesize
36.1MB

Download
memory/1704-136-0x0000000002030000-0x0000000004443000-memory.dmp

Filesize
36.1MB

Download
memory/1704-137-0x0000000002030000-0x0000000004443000-memory.dmp

Filesize
36.1MB

Download
memory/1704-138-0x0000000002030000-0x0000000004443000-memory.dmp

Filesize
36.1MB

Download
memory/1704-133-0x0000000002030000-0x0000000004443000-memory.dmp

Filesize
36.1MB

Download
memory/1704-140-0x0000000002030000-0x0000000004443000-memory.dmp

Filesize
36.1MB

Download
memory/1704-135-0x0000000002030000-0x0000000004443000-memory.dmp

Filesize
36.1MB

Download
memory/1704-142-0x0000000002030000-0x0000000004443000-memory.dmp

Filesize
36.1MB

Download
memory/1704-143-0x0000000002030000-0x0000000004443000-memory.dmp

Filesize
36.1MB

Download
memory/1704-144-0x0000000002030000-0x0000000004443000-memory.dmp

Filesize
36.1MB

Download
memory/1704-146-0x0000000061E00000-0x0000000061EC1000-memory.dmp

Filesize
772KB

Download
memory/1704-134-0x0000000002030000-0x0000000004443000-memory.dmp

Filesize
36.1MB

Download
memory/1704-169-0x0000000002030000-0x0000000004443000-memory.dmp

Filesize
36.1MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads