buer | f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8

Analysis

max time kernel
62s
max time network
126s
platform
windows10-2004_x64
resource
win10v2004-20220721-en
resource tags

arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system
submitted
24/07/2022, 17:11

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General

Target
f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8.exe
Size 2.0MB
Sample220724-vqaafacbdl
SHA256 f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8
MD5 d3d83d82b0fc9300b736cbe55fb82445
SHA1 b4690a316a6469738f4d38445b37b34a0e686742
SHA512 19c82cd3114ebb420d07d0926aafbb482a450cc2b31b50cdd3cac23a4a45f16686f893610ba4bc942ef902c9478afa13ee5b91e935ced9ee92141a41cfea4942
MD5 SHA1 SHA512

Score

10^/10

buer evasion loader persistence

Malware Config

Extracted

Family

buer

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-1-5-21-2660308776-3705150086-26593515-1000\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
behavioral2/memory/4996-134-0x000000003FC90000-0x0000000040171000-memory.dmp	buer
behavioral2/memory/4356-139-0x000000003F310000-0x000000003F7F1000-memory.dmp	buer
behavioral2/memory/4356-140-0x000000003F310000-0x000000003F7F1000-memory.dmp	buer
behavioral2/memory/4356-142-0x000000003F310000-0x000000003F7F1000-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__	f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	plugin.exe

Executes dropped EXE 1 IoCs

pid	Process
4356	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	f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	plugin.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	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-1-5-21-2660308776-3705150086-26593515-1000\Software\Wine	f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8.exe
Key opened	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\Software\Wine	plugin.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4996	f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8.exe
4356	plugin.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4180	1600	WerFault.exe	81

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4996	f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8.exe
4996	f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8.exe
4356	plugin.exe
4356	plugin.exe
4356	plugin.exe
4356	plugin.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4996 wrote to memory of 4356	4996	f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8.exe	80
PID 4996 wrote to memory of 4356	4996	f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8.exe	80
PID 4996 wrote to memory of 4356	4996	f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8.exe	80
PID 4356 wrote to memory of 1600	4356	plugin.exe	81
PID 4356 wrote to memory of 1600	4356	plugin.exe	81
PID 4356 wrote to memory of 1600	4356	plugin.exe	81
PID 4356 wrote to memory of 1600	4356	plugin.exe	81
PID 4356 wrote to memory of 1600	4356	plugin.exe	81
PID 4356 wrote to memory of 1600	4356	plugin.exe	81
PID 4356 wrote to memory of 1600	4356	plugin.exe	81
PID 4356 wrote to memory of 1600	4356	plugin.exe	81
PID 4356 wrote to memory of 1600	4356	plugin.exe	81
PID 4356 wrote to memory of 1600	4356	plugin.exe	81
PID 4356 wrote to memory of 1600	4356	plugin.exe	81
PID 4356 wrote to memory of 1600	4356	plugin.exe	81

C:\Users\Admin\AppData\Local\Temp\f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8.exe
"C:\Users\Admin\AppData\Local\Temp\f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4996
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Identifies Wine through registry keys
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4356
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:1600
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1600 -s 220
      4⤵
      Program crash
      PID:4180

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1600 -ip 1600
1⤵
PID:4220

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

plugin.exe

Path C:\ProgramData\UBlockPlugin\plugin.exe
Size 2.0MB
SHA256 f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8
MD5 d3d83d82b0fc9300b736cbe55fb82445
SHA1 b4690a316a6469738f4d38445b37b34a0e686742
SHA512 19c82cd3114ebb420d07d0926aafbb482a450cc2b31b50cdd3cac23a4a45f16686f893610ba4bc942ef902c9478afa13ee5b91e935ced9ee92141a41cfea4942
SSDEEP 49152:WG/CiuO2ak/Zg30hnB7nvfa4B29yVmGJTpegEC:WJiuv3/ZgUBLvfa4B29eZ
MD5 SHA1 SHA512 SSDEEP

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plugin.exe

Path C:\ProgramData\UBlockPlugin\plugin.exe
Size 2.0MB
SHA256 f496e1cd3b7c86e1d1f3e5ae4ede6e64c7e44e127499ba9384eb57a3191c32b8
MD5 d3d83d82b0fc9300b736cbe55fb82445
SHA1 b4690a316a6469738f4d38445b37b34a0e686742
SHA512 19c82cd3114ebb420d07d0926aafbb482a450cc2b31b50cdd3cac23a4a45f16686f893610ba4bc942ef902c9478afa13ee5b91e935ced9ee92141a41cfea4942
SSDEEP 49152:WG/CiuO2ak/Zg30hnB7nvfa4B29yVmGJTpegEC:WJiuv3/ZgUBLvfa4B29eZ
MD5 SHA1 SHA512 SSDEEP

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memory/4356-136-0x000000003F310000-0x000000003F7F1000-memory.dmp

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memory/4356-138-0x00000000776D0000-0x0000000077873000-memory.dmp

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memory/4356-139-0x000000003F310000-0x000000003F7F1000-memory.dmp

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memory/4356-140-0x000000003F310000-0x000000003F7F1000-memory.dmp

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memory/4356-141-0x00000000776D0000-0x0000000077873000-memory.dmp

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memory/4356-142-0x000000003F310000-0x000000003F7F1000-memory.dmp

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memory/4996-134-0x000000003FC90000-0x0000000040171000-memory.dmp

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memory/4996-135-0x00000000776D0000-0x0000000077873000-memory.dmp

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memory/4996-130-0x000000003FC90000-0x0000000040171000-memory.dmp

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