buer | ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105

General

Target

ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105.exe
Size

1.7MB
MD5

e24c03961d09e9ee6c218981e054af2a
SHA1

fcb86a0766159acffb08a785239a1af16010d9ff
SHA256

ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105
SHA512

0d724d370d46357d0041ed7646bc053ca49b8fb4efea7be8c965b79acc733b88eb61052b1dd4b58eb0221aef34d00aff10f292d69a4347ef8a0d41c91bf63ee1

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-1-5-21-1809750270-3141839489-3074374771-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\ErrorResponder\\errorResponder.exe\""	errorResponder.exe

Buer Loader 7 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/3376-132-0x000000003F320000-0x000000003F76D000-memory.dmp	buer
behavioral2/memory/3376-133-0x000000003F320000-0x000000003F76D000-memory.dmp	buer
behavioral2/memory/3376-134-0x000000003F320000-0x000000003F76D000-memory.dmp	buer
behavioral2/memory/3376-138-0x000000003F320000-0x000000003F76D000-memory.dmp	buer
behavioral2/memory/4460-142-0x000000003F6A0000-0x000000003FAED000-memory.dmp	buer
behavioral2/memory/4460-143-0x000000003F6A0000-0x000000003FAED000-memory.dmp	buer
behavioral2/memory/4460-144-0x000000003F6A0000-0x000000003FAED000-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__	ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	errorResponder.exe

Executes dropped EXE 1 IoCs

pid	Process
4460	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	ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105.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-1-5-21-1809750270-3141839489-3074374771-1000\Software\Wine	ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105.exe
Key opened	\REGISTRY\USER\S-1-5-21-1809750270-3141839489-3074374771-1000\Software\Wine	errorResponder.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3376	ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105.exe
4460	errorResponder.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
2288	3784	WerFault.exe	92
2544	3784	WerFault.exe	92

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3376	ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105.exe
3376	ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105.exe
4460	errorResponder.exe
4460	errorResponder.exe
4460	errorResponder.exe
4460	errorResponder.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3376 wrote to memory of 4460	3376	ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105.exe	91
PID 3376 wrote to memory of 4460	3376	ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105.exe	91
PID 3376 wrote to memory of 4460	3376	ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105.exe	91
PID 4460 wrote to memory of 3784	4460	errorResponder.exe	92
PID 4460 wrote to memory of 3784	4460	errorResponder.exe	92
PID 4460 wrote to memory of 3784	4460	errorResponder.exe	92
PID 4460 wrote to memory of 3784	4460	errorResponder.exe	92
PID 4460 wrote to memory of 3784	4460	errorResponder.exe	92
PID 4460 wrote to memory of 3784	4460	errorResponder.exe	92
PID 4460 wrote to memory of 3784	4460	errorResponder.exe	92
PID 4460 wrote to memory of 3784	4460	errorResponder.exe	92
PID 4460 wrote to memory of 3784	4460	errorResponder.exe	92
PID 4460 wrote to memory of 3784	4460	errorResponder.exe	92
PID 4460 wrote to memory of 3784	4460	errorResponder.exe	92
PID 4460 wrote to memory of 3784	4460	errorResponder.exe	92

C:\Users\Admin\AppData\Local\Temp\ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105.exe
"C:\Users\Admin\AppData\Local\Temp\ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105.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:3376
- C:\ProgramData\ErrorResponder\errorResponder.exe
  C:\ProgramData\ErrorResponder\errorResponder.exe "C:\Users\Admin\AppData\Local\Temp\ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105.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:4460
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\ErrorResponder\errorResponder.exe
    3⤵
    PID:3784
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3784 -s 272
      4⤵
      Program crash
      PID:2288
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3784 -s 280
      4⤵
      Program crash
      PID:2544

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 3784 -ip 3784
1⤵
PID:4352

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 3784 -ip 3784
1⤵
PID:1408

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
e24c03961d09e9ee6c218981e054af2a

SHA1
fcb86a0766159acffb08a785239a1af16010d9ff

SHA256
ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105

SHA512
0d724d370d46357d0041ed7646bc053ca49b8fb4efea7be8c965b79acc733b88eb61052b1dd4b58eb0221aef34d00aff10f292d69a4347ef8a0d41c91bf63ee1

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

Filesize
1.7MB

MD5
e24c03961d09e9ee6c218981e054af2a

SHA1
fcb86a0766159acffb08a785239a1af16010d9ff

SHA256
ba9226a0aca438b5d53eac4025127cb5b8efd81a1b13104447491eba11078105

SHA512
0d724d370d46357d0041ed7646bc053ca49b8fb4efea7be8c965b79acc733b88eb61052b1dd4b58eb0221aef34d00aff10f292d69a4347ef8a0d41c91bf63ee1

Download Submit
memory/3376-138-0x000000003F320000-0x000000003F76D000-memory.dmp

Filesize
4.3MB

Download
memory/3376-139-0x00000000773A0000-0x0000000077543000-memory.dmp

Filesize
1.6MB

Download
memory/3376-134-0x000000003F320000-0x000000003F76D000-memory.dmp

Filesize
4.3MB

Download
memory/3376-133-0x000000003F320000-0x000000003F76D000-memory.dmp

Filesize
4.3MB

Download
memory/3376-132-0x000000003F320000-0x000000003F76D000-memory.dmp

Filesize
4.3MB

Download
memory/3376-131-0x00000000773A0000-0x0000000077543000-memory.dmp

Filesize
1.6MB

Download
memory/3376-130-0x000000003F320000-0x000000003F76D000-memory.dmp

Filesize
4.3MB

Download
memory/3784-146-0x0000000001200000-0x000000000164D000-memory.dmp

Filesize
4.3MB

Download
memory/4460-140-0x000000003F6A0000-0x000000003FAED000-memory.dmp

Filesize
4.3MB

Download
memory/4460-141-0x00000000773A0000-0x0000000077543000-memory.dmp

Filesize
1.6MB

Download
memory/4460-142-0x000000003F6A0000-0x000000003FAED000-memory.dmp

Filesize
4.3MB

Download
memory/4460-143-0x000000003F6A0000-0x000000003FAED000-memory.dmp

Filesize
4.3MB

Download
memory/4460-144-0x000000003F6A0000-0x000000003FAED000-memory.dmp

Filesize
4.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads