2c8fbaab0bb4085632595ab9224c9501cb9b6a0ff65290b4fb05bed13f005353

General

Target

yerex.exe
Size

25.2MB
MD5

0bbb4624436007933ff6dc22b1820f18
SHA1

b7733a8d52b60a0909ecc45237a3679354220908
SHA256

98cb3e01c7990a6222f387adda3a1e3c4316d7b68f3da250dc6754ee0086c6cc
SHA512

6a7161030b49374c5c46f37ea12f82d2500ca76f10e9abeeb2a55421385d075e771c3ff4a74ed35f01b6d0c651f5e51dcf63fe0db9a40196225db335e3e07cd3
SSDEEP

786432:xhnEKv3rAKZaCdT0kjZeVBy7DbWF1snuI/kaJ4dHA:vnNvrXTmFKn//kax

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

Processes:

yerex.exe

description ioc process

Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ yerex.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	yerex.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

Processes:

yerex.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	yerex.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	yerex.exe

Executes dropped EXE 1 IoCs

Processes:

main.exe

pid process

2188 main.exe
Loads dropped DLL 2 IoCs

Processes:

yerex.exemain.exe

pid process

1740 yerex.exe
2188 main.exe

pid	process
2188	main.exe

pid	process
1740	yerex.exe
2188	main.exe

Themida packer 8 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral1/memory/1740-0-0x0000000140000000-0x0000000141F87000-memory.dmp	themida
behavioral1/memory/1740-2-0x0000000140000000-0x0000000141F87000-memory.dmp	themida
behavioral1/memory/1740-3-0x0000000140000000-0x0000000141F87000-memory.dmp	themida
behavioral1/memory/1740-4-0x0000000140000000-0x0000000141F87000-memory.dmp	themida
behavioral1/memory/1740-5-0x0000000140000000-0x0000000141F87000-memory.dmp	themida
behavioral1/memory/1740-24-0x0000000140000000-0x0000000141F87000-memory.dmp	themida
behavioral1/memory/1740-1004-0x0000000140000000-0x0000000141F87000-memory.dmp	themida
behavioral1/memory/1740-1996-0x0000000140000000-0x0000000141F87000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

yerex.exe

description ioc process

Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA yerex.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

Processes:

yerex.exe

pid process

1740 yerex.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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

pid	process
1740	yerex.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

yerex.exe

description	pid	process	target process
PID 1740 wrote to memory of 2188	1740	yerex.exe	main.exe
PID 1740 wrote to memory of 2188	1740	yerex.exe	main.exe
PID 1740 wrote to memory of 2188	1740	yerex.exe	main.exe

C:\Users\Admin\AppData\Local\Temp\yerex.exe
"C:\Users\Admin\AppData\Local\Temp\yerex.exe"
1⤵
- 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 use of WriteProcessMemory
PID:1740
- C:\Users\Admin\AppData\Local\Temp\onefile_1740_133768407461742000\main.exe
  C:\Users\Admin\AppData\Local\Temp\yerex.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  PID:2188

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

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\onefile_1740_133768407461742000\python312.dll

Filesize
6.6MB

MD5
d521654d889666a0bc753320f071ef60

SHA1
5fd9b90c5d0527e53c199f94bad540c1e0985db6

SHA256
21700f0bad5769a1b61ea408dc0a140ffd0a356a774c6eb0cc70e574b929d2e2

SHA512
7a726835423a36de80fb29ef65dfe7150bd1567cac6f3569e24d9fe091496c807556d0150456429a3d1a6fd2ed0b8ae3128ea3b8674c97f42ce7c897719d2cd3

Download Submit
\Users\Admin\AppData\Local\Temp\onefile_1740_133768407461742000\main.exe

Filesize
30.4MB

MD5
2173bde8e47c7babfafdccdccad66fa2

SHA1
46733948c63f36de3eb171abe82d3c472a63bdcd

SHA256
44d04386761298d8890a11562e1bc7e93e2d40ab9b5dc838f9b79d289ae8b58a

SHA512
38134e6bbe888bedb2874f13e21b9a7b1ca4bc3e7c10f9297deb7d24f9a758c7d59b9a6a51db0bf48f6f0f9843cc0e8cec750c753e4e0e1c0f52309f6dd4ce11

Download Submit
memory/1740-0-0x0000000140000000-0x0000000141F87000-memory.dmp

Filesize
31.5MB

Download
memory/1740-1-0x0000000077C30000-0x0000000077C32000-memory.dmp

Filesize
8KB

Download
memory/1740-2-0x0000000140000000-0x0000000141F87000-memory.dmp

Filesize
31.5MB

Download
memory/1740-3-0x0000000140000000-0x0000000141F87000-memory.dmp

Filesize
31.5MB

Download
memory/1740-4-0x0000000140000000-0x0000000141F87000-memory.dmp

Filesize
31.5MB

Download
memory/1740-5-0x0000000140000000-0x0000000141F87000-memory.dmp

Filesize
31.5MB

Download
memory/1740-24-0x0000000140000000-0x0000000141F87000-memory.dmp

Filesize
31.5MB

Download
memory/1740-1004-0x0000000140000000-0x0000000141F87000-memory.dmp

Filesize
31.5MB

Download
memory/1740-1996-0x0000000140000000-0x0000000141F87000-memory.dmp

Filesize
31.5MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads