buer | 2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db

General

Target

2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db.exe
Size

1.7MB
MD5

4f73059dff7c802ba913d7829486ea61
SHA1

e9ea29c2ca2cdc156b624c8001eeb62d508958b7
SHA256

2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db
SHA512

a15ee3950e35af46dcbe4751a493d3f07f0194b04057ee2ab1687679f5a0a44672b0efe6845faa3315a79146f5e75390f0e11bfa739dabc048f9e710ba4902ce

Score

10^/10

buer evasion loader persistence

Malware Config

Extracted

Family

buer

C2

http://bbload01.top/

http://bbload02.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-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\ErrorResponder\\errorResponder.exe\""	errorResponder.exe

Buer Loader 6 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/984-130-0x000000003F4F0000-0x000000003F93F000-memory.dmp	buer
behavioral2/memory/984-132-0x000000003F4F0000-0x000000003F93F000-memory.dmp	buer
behavioral2/memory/984-136-0x000000003F4F0000-0x000000003F93F000-memory.dmp	buer
behavioral2/memory/5044-140-0x000000003FFD0000-0x000000004041F000-memory.dmp	buer
behavioral2/memory/5044-141-0x000000003FFD0000-0x000000004041F000-memory.dmp	buer
behavioral2/memory/5044-143-0x000000003FFD0000-0x000000004041F000-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__	2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	errorResponder.exe

Executes dropped EXE 1 IoCs

pid	Process
5044	errorResponder.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	2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	errorResponder.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	errorResponder.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-1-5-21-3751123196-3323558407-1869646069-1000\Software\Wine	2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db.exe
Key opened	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Software\Wine	errorResponder.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
984	2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db.exe
5044	errorResponder.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
5052	3464	WerFault.exe	89
3928	3464	WerFault.exe	89

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
984	2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db.exe
984	2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db.exe
5044	errorResponder.exe
5044	errorResponder.exe
5044	errorResponder.exe
5044	errorResponder.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 984 wrote to memory of 5044	984	2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db.exe	88
PID 984 wrote to memory of 5044	984	2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db.exe	88
PID 984 wrote to memory of 5044	984	2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db.exe	88
PID 5044 wrote to memory of 3464	5044	errorResponder.exe	89
PID 5044 wrote to memory of 3464	5044	errorResponder.exe	89
PID 5044 wrote to memory of 3464	5044	errorResponder.exe	89
PID 5044 wrote to memory of 3464	5044	errorResponder.exe	89
PID 5044 wrote to memory of 3464	5044	errorResponder.exe	89
PID 5044 wrote to memory of 3464	5044	errorResponder.exe	89
PID 5044 wrote to memory of 3464	5044	errorResponder.exe	89
PID 5044 wrote to memory of 3464	5044	errorResponder.exe	89
PID 5044 wrote to memory of 3464	5044	errorResponder.exe	89
PID 5044 wrote to memory of 3464	5044	errorResponder.exe	89
PID 5044 wrote to memory of 3464	5044	errorResponder.exe	89
PID 5044 wrote to memory of 3464	5044	errorResponder.exe	89

C:\Users\Admin\AppData\Local\Temp\2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db.exe
"C:\Users\Admin\AppData\Local\Temp\2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db.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:984
- C:\ProgramData\ErrorResponder\errorResponder.exe
  C:\ProgramData\ErrorResponder\errorResponder.exe "C:\Users\Admin\AppData\Local\Temp\2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db.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:5044
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\ErrorResponder\errorResponder.exe
    3⤵
    PID:3464
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3464 -s 272
      4⤵
      Program crash
      PID:5052
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3464 -s 280
      4⤵
      Program crash
      PID:3928

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3464 -ip 3464
1⤵
PID:1340

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 3464 -ip 3464
1⤵
PID:1904

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\ErrorResponder\errorResponder.exe

Filesize
1.7MB

MD5
4f73059dff7c802ba913d7829486ea61

SHA1
e9ea29c2ca2cdc156b624c8001eeb62d508958b7

SHA256
2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db

SHA512
a15ee3950e35af46dcbe4751a493d3f07f0194b04057ee2ab1687679f5a0a44672b0efe6845faa3315a79146f5e75390f0e11bfa739dabc048f9e710ba4902ce

Download Submit
C:\ProgramData\ErrorResponder\errorResponder.exe

Filesize
1.7MB

MD5
4f73059dff7c802ba913d7829486ea61

SHA1
e9ea29c2ca2cdc156b624c8001eeb62d508958b7

SHA256
2d0454cf4f68e1d60a1a0fcc15092f2d4948ea0b849003ec1950726ce66e89db

SHA512
a15ee3950e35af46dcbe4751a493d3f07f0194b04057ee2ab1687679f5a0a44672b0efe6845faa3315a79146f5e75390f0e11bfa739dabc048f9e710ba4902ce

Download Submit
memory/984-131-0x0000000077470000-0x0000000077613000-memory.dmp

Filesize
1.6MB

Download
memory/984-132-0x000000003F4F0000-0x000000003F93F000-memory.dmp

Filesize
4.3MB

Download
memory/984-136-0x000000003F4F0000-0x000000003F93F000-memory.dmp

Filesize
4.3MB

Download
memory/984-138-0x0000000077470000-0x0000000077613000-memory.dmp

Filesize
1.6MB

Download
memory/984-130-0x000000003F4F0000-0x000000003F93F000-memory.dmp

Filesize
4.3MB

Download
memory/3464-145-0x0000000000800000-0x0000000000C4F000-memory.dmp

Filesize
4.3MB

Download
memory/5044-137-0x000000003FFD0000-0x000000004041F000-memory.dmp

Filesize
4.3MB

Download
memory/5044-140-0x000000003FFD0000-0x000000004041F000-memory.dmp

Filesize
4.3MB

Download
memory/5044-141-0x000000003FFD0000-0x000000004041F000-memory.dmp

Filesize
4.3MB

Download
memory/5044-142-0x0000000077470000-0x0000000077613000-memory.dmp

Filesize
1.6MB

Download
memory/5044-143-0x000000003FFD0000-0x000000004041F000-memory.dmp

Filesize
4.3MB

Download
memory/5044-139-0x0000000077470000-0x0000000077613000-memory.dmp

Filesize
1.6MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads