buer | a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f

General

Target

a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f.exe
Size

2.0MB
MD5

4fc7a093ce5048cf943b039ea39c1e60
SHA1

dc5d7f205723e37e55b90e725991222b503b963a
SHA256

a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f
SHA512

5d33ea3bc56f778782d8580fb82a9ae85f0029ddf6bcfbeaca92b177a92fc8b2a3681abb39c1929ab7cb60b3f9c4d5206944fa1d8f31671675fd0d8ffb936498

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-1-5-21-2372564722-193526734-2636556182-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\UBlockPlugin\\plugin.exe\""	plugin.exe

Buer Loader 5 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/968-132-0x000000003F080000-0x000000003F569000-memory.dmp	buer
behavioral2/memory/968-136-0x000000003F080000-0x000000003F569000-memory.dmp	buer
behavioral2/memory/1188-140-0x000000003F130000-0x000000003F619000-memory.dmp	buer
behavioral2/memory/1188-142-0x000000003F130000-0x000000003F619000-memory.dmp	buer
behavioral2/memory/1188-144-0x000000003F130000-0x000000003F619000-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__	a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	plugin.exe

Executes dropped EXE 1 IoCs

pid	Process
1188	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	a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f.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-1-5-21-2372564722-193526734-2636556182-1000\Software\Wine	a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f.exe
Key opened	\REGISTRY\USER\S-1-5-21-2372564722-193526734-2636556182-1000\Software\Wine	plugin.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
968	a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f.exe
1188	plugin.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3680	392	WerFault.exe	83

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
968	a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f.exe
968	a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f.exe
1188	plugin.exe
1188	plugin.exe
1188	plugin.exe
1188	plugin.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 968 wrote to memory of 1188	968	a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f.exe	82
PID 968 wrote to memory of 1188	968	a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f.exe	82
PID 968 wrote to memory of 1188	968	a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f.exe	82
PID 1188 wrote to memory of 392	1188	plugin.exe	83
PID 1188 wrote to memory of 392	1188	plugin.exe	83
PID 1188 wrote to memory of 392	1188	plugin.exe	83
PID 1188 wrote to memory of 392	1188	plugin.exe	83
PID 1188 wrote to memory of 392	1188	plugin.exe	83
PID 1188 wrote to memory of 392	1188	plugin.exe	83
PID 1188 wrote to memory of 392	1188	plugin.exe	83
PID 1188 wrote to memory of 392	1188	plugin.exe	83
PID 1188 wrote to memory of 392	1188	plugin.exe	83
PID 1188 wrote to memory of 392	1188	plugin.exe	83
PID 1188 wrote to memory of 392	1188	plugin.exe	83
PID 1188 wrote to memory of 392	1188	plugin.exe	83

C:\Users\Admin\AppData\Local\Temp\a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f.exe
"C:\Users\Admin\AppData\Local\Temp\a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f.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:968
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f.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:1188
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:392
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 392 -s 220
      4⤵
      Program crash
      PID:3680

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 392 -ip 392
1⤵
PID:900

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
2.0MB

MD5
4fc7a093ce5048cf943b039ea39c1e60

SHA1
dc5d7f205723e37e55b90e725991222b503b963a

SHA256
a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f

SHA512
5d33ea3bc56f778782d8580fb82a9ae85f0029ddf6bcfbeaca92b177a92fc8b2a3681abb39c1929ab7cb60b3f9c4d5206944fa1d8f31671675fd0d8ffb936498

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

Filesize
2.0MB

MD5
4fc7a093ce5048cf943b039ea39c1e60

SHA1
dc5d7f205723e37e55b90e725991222b503b963a

SHA256
a6d1d66c30c7b3a9b204bc7161b96983369a4e76e6511888814a5d2397bcbe5f

SHA512
5d33ea3bc56f778782d8580fb82a9ae85f0029ddf6bcfbeaca92b177a92fc8b2a3681abb39c1929ab7cb60b3f9c4d5206944fa1d8f31671675fd0d8ffb936498

Download Submit
memory/968-131-0x00000000771F0000-0x0000000077393000-memory.dmp

Filesize
1.6MB

Download
memory/968-132-0x000000003F080000-0x000000003F569000-memory.dmp

Filesize
4.9MB

Download
memory/968-136-0x000000003F080000-0x000000003F569000-memory.dmp

Filesize
4.9MB

Download
memory/968-130-0x000000003F080000-0x000000003F569000-memory.dmp

Filesize
4.9MB

Download
memory/968-137-0x00000000771F0000-0x0000000077393000-memory.dmp

Filesize
1.6MB

Download
memory/1188-139-0x00000000771F0000-0x0000000077393000-memory.dmp

Filesize
1.6MB

Download
memory/1188-140-0x000000003F130000-0x000000003F619000-memory.dmp

Filesize
4.9MB

Download
memory/1188-138-0x000000003F130000-0x000000003F619000-memory.dmp

Filesize
4.9MB

Download
memory/1188-142-0x000000003F130000-0x000000003F619000-memory.dmp

Filesize
4.9MB

Download
memory/1188-143-0x00000000771F0000-0x0000000077393000-memory.dmp

Filesize
1.6MB

Download
memory/1188-144-0x000000003F130000-0x000000003F619000-memory.dmp

Filesize
4.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads