buer | 9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda

General

Target

9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe
Size

1.8MB
MD5

329bd1008c63fa9abf81cd6afd7a6559
SHA1

d07885a5899b13294672a3f396ec445dd8b09529
SHA256

9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda
SHA512

289f56d591ed7c542d0dec58a5d107713af35f2b50f1bb6ccc841c8114b833942d47c4c9da8061e750ccd1ab06649dfb4a039d6a658807c82a8e95b0afcaf78f

Score

10^/10

buer evasion loader persistence

Malware Config

Extracted

Family

buer

C2

http://loy01.top/

http://loy02.top/

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4084403625-2215941253-1760665084-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\UBlockPlugin\\plugin.exe\""	plugin.exe

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral1/memory/1896-58-0x000000003FCB0000-0x0000000040135000-memory.dmp	buer
behavioral1/memory/2036-63-0x0000000076EB0000-0x0000000077030000-memory.dmp	buer
behavioral1/memory/2036-64-0x000000003F050000-0x000000003F4D5000-memory.dmp	buer
behavioral1/memory/2036-67-0x000000003F050000-0x000000003F4D5000-memory.dmp	buer

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

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	plugin.exe

Executes dropped EXE 1 IoCs

pid	Process
2036	plugin.exe

Checks BIOS information in registry 2 TTPs 4 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	9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	plugin.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	plugin.exe

Deletes itself 1 IoCs

pid	Process
2036	plugin.exe

Identifies Wine through registry keys 2 TTPs 2 IoCs

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

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4084403625-2215941253-1760665084-1000\Software\Wine	9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe
Key opened	\REGISTRY\USER\S-1-5-21-4084403625-2215941253-1760665084-1000\Software\Wine	plugin.exe

Loads dropped DLL 2 IoCs

pid	Process
1896	9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe
1896	9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1896	9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe
2036	plugin.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1896	9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe
2036	plugin.exe
2036	plugin.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1896 wrote to memory of 2036	1896	9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe	28
PID 1896 wrote to memory of 2036	1896	9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe	28
PID 1896 wrote to memory of 2036	1896	9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe	28
PID 1896 wrote to memory of 2036	1896	9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe	28
PID 2036 wrote to memory of 1236	2036	plugin.exe	29
PID 2036 wrote to memory of 1236	2036	plugin.exe	29
PID 2036 wrote to memory of 1236	2036	plugin.exe	29
PID 2036 wrote to memory of 1236	2036	plugin.exe	29

C:\Users\Admin\AppData\Local\Temp\9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe
"C:\Users\Admin\AppData\Local\Temp\9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1896
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Deletes itself
  - Identifies Wine through registry keys
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2036
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:1236

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Query Registry

3

T1012

System Information Discovery

1

T1082

Virtualization/Sandbox Evasion

2

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\UBlockPlugin\plugin.exe

Filesize
1.8MB

MD5
329bd1008c63fa9abf81cd6afd7a6559

SHA1
d07885a5899b13294672a3f396ec445dd8b09529

SHA256
9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda

SHA512
289f56d591ed7c542d0dec58a5d107713af35f2b50f1bb6ccc841c8114b833942d47c4c9da8061e750ccd1ab06649dfb4a039d6a658807c82a8e95b0afcaf78f

Download Submit
C:\ProgramData\UBlockPlugin\plugin.exe

Filesize
1.8MB

MD5
329bd1008c63fa9abf81cd6afd7a6559

SHA1
d07885a5899b13294672a3f396ec445dd8b09529

SHA256
9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda

SHA512
289f56d591ed7c542d0dec58a5d107713af35f2b50f1bb6ccc841c8114b833942d47c4c9da8061e750ccd1ab06649dfb4a039d6a658807c82a8e95b0afcaf78f

Download Submit
\ProgramData\UBlockPlugin\plugin.exe

Filesize
1.8MB

MD5
329bd1008c63fa9abf81cd6afd7a6559

SHA1
d07885a5899b13294672a3f396ec445dd8b09529

SHA256
9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda

SHA512
289f56d591ed7c542d0dec58a5d107713af35f2b50f1bb6ccc841c8114b833942d47c4c9da8061e750ccd1ab06649dfb4a039d6a658807c82a8e95b0afcaf78f

Download Submit
\ProgramData\UBlockPlugin\plugin.exe

Filesize
1.8MB

MD5
329bd1008c63fa9abf81cd6afd7a6559

SHA1
d07885a5899b13294672a3f396ec445dd8b09529

SHA256
9431b3a7e09d260d61fd0363e29c865d092976f2695339a8e6152fa1f1db4fda

SHA512
289f56d591ed7c542d0dec58a5d107713af35f2b50f1bb6ccc841c8114b833942d47c4c9da8061e750ccd1ab06649dfb4a039d6a658807c82a8e95b0afcaf78f

Download Submit
memory/1896-60-0x000000003F050000-0x000000003F4D5000-memory.dmp

Filesize
4.5MB

Download
memory/1896-54-0x0000000075B61000-0x0000000075B63000-memory.dmp

Filesize
8KB

Download
memory/1896-61-0x0000000076EB0000-0x0000000077030000-memory.dmp

Filesize
1.5MB

Download
memory/1896-58-0x000000003FCB0000-0x0000000040135000-memory.dmp

Filesize
4.5MB

Download
memory/2036-63-0x0000000076EB0000-0x0000000077030000-memory.dmp

Filesize
1.5MB

Download
memory/2036-64-0x000000003F050000-0x000000003F4D5000-memory.dmp

Filesize
4.5MB

Download
memory/2036-66-0x0000000076EB0000-0x0000000077030000-memory.dmp

Filesize
1.5MB

Download
memory/2036-67-0x000000003F050000-0x000000003F4D5000-memory.dmp

Filesize
4.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads