buer | aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b

General

Target

aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b.exe
Size

2.0MB
MD5

3eca81e66df552071c3496eab4de2eae
SHA1

4e11906bfc2ce971bfd1221f8552f960c632a811
SHA256

aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b
SHA512

bd695b323e2c581610e41c16c671f5e1ca4b9913075846233ffc6b81611b6f0afa2a953f5ae1b98733af597286568da823311c78717898f21586dacb9705b7d4

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-1-5-21-2632097139-1792035885-811742494-1000\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/4100-131-0x000000003F8F0000-0x000000003FDD4000-memory.dmp	buer
behavioral2/memory/4100-133-0x000000003F8F0000-0x000000003FDD4000-memory.dmp	buer
behavioral2/memory/4100-137-0x000000003F8F0000-0x000000003FDD4000-memory.dmp	buer
behavioral2/memory/4324-141-0x000000003FFB0000-0x0000000040494000-memory.dmp	buer
behavioral2/memory/4324-142-0x000000003FFB0000-0x0000000040494000-memory.dmp	buer
behavioral2/memory/4324-143-0x000000003FFB0000-0x0000000040494000-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__	aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	errorResponder.exe

Executes dropped EXE 1 IoCs

pid	Process
4324	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\VideoBiosVersion	errorResponder.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	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-1-5-21-2632097139-1792035885-811742494-1000\Software\Wine	errorResponder.exe
Key opened	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Software\Wine	aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4100	aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b.exe
4324	errorResponder.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
1880	1124	WerFault.exe	82
708	1124	WerFault.exe	82

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4100	aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b.exe
4100	aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b.exe
4324	errorResponder.exe
4324	errorResponder.exe
4324	errorResponder.exe
4324	errorResponder.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4100 wrote to memory of 4324	4100	aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b.exe	81
PID 4100 wrote to memory of 4324	4100	aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b.exe	81
PID 4100 wrote to memory of 4324	4100	aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b.exe	81
PID 4324 wrote to memory of 1124	4324	errorResponder.exe	82
PID 4324 wrote to memory of 1124	4324	errorResponder.exe	82
PID 4324 wrote to memory of 1124	4324	errorResponder.exe	82
PID 4324 wrote to memory of 1124	4324	errorResponder.exe	82
PID 4324 wrote to memory of 1124	4324	errorResponder.exe	82
PID 4324 wrote to memory of 1124	4324	errorResponder.exe	82
PID 4324 wrote to memory of 1124	4324	errorResponder.exe	82
PID 4324 wrote to memory of 1124	4324	errorResponder.exe	82
PID 4324 wrote to memory of 1124	4324	errorResponder.exe	82
PID 4324 wrote to memory of 1124	4324	errorResponder.exe	82
PID 4324 wrote to memory of 1124	4324	errorResponder.exe	82
PID 4324 wrote to memory of 1124	4324	errorResponder.exe	82

C:\Users\Admin\AppData\Local\Temp\aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b.exe
"C:\Users\Admin\AppData\Local\Temp\aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b.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:4100
- C:\ProgramData\ErrorResponder\errorResponder.exe
  C:\ProgramData\ErrorResponder\errorResponder.exe "C:\Users\Admin\AppData\Local\Temp\aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b.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:4324
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\ErrorResponder\errorResponder.exe
    3⤵
    PID:1124
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1124 -s 276
      4⤵
      Program crash
      PID:1880
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1124 -s 292
      4⤵
      Program crash
      PID:708

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1124 -ip 1124
1⤵
PID:2284

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 1124 -ip 1124
1⤵
PID:3008

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
2.0MB

MD5
3eca81e66df552071c3496eab4de2eae

SHA1
4e11906bfc2ce971bfd1221f8552f960c632a811

SHA256
aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b

SHA512
bd695b323e2c581610e41c16c671f5e1ca4b9913075846233ffc6b81611b6f0afa2a953f5ae1b98733af597286568da823311c78717898f21586dacb9705b7d4

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

Filesize
2.0MB

MD5
3eca81e66df552071c3496eab4de2eae

SHA1
4e11906bfc2ce971bfd1221f8552f960c632a811

SHA256
aba14d216e8ceb209841014dadbe46398c97aec488e4127516541f6b1f3ac61b

SHA512
bd695b323e2c581610e41c16c671f5e1ca4b9913075846233ffc6b81611b6f0afa2a953f5ae1b98733af597286568da823311c78717898f21586dacb9705b7d4

Download Submit
memory/1124-145-0x0000000000E00000-0x00000000012E4000-memory.dmp

Filesize
4.9MB

Download
memory/4100-131-0x000000003F8F0000-0x000000003FDD4000-memory.dmp

Filesize
4.9MB

Download
memory/4100-132-0x0000000077220000-0x00000000773C3000-memory.dmp

Filesize
1.6MB

Download
memory/4100-133-0x000000003F8F0000-0x000000003FDD4000-memory.dmp

Filesize
4.9MB

Download
memory/4100-136-0x0000000077220000-0x00000000773C3000-memory.dmp

Filesize
1.6MB

Download
memory/4100-137-0x000000003F8F0000-0x000000003FDD4000-memory.dmp

Filesize
4.9MB

Download
memory/4100-130-0x000000003F8F0000-0x000000003FDD4000-memory.dmp

Filesize
4.9MB

Download
memory/4324-138-0x000000003FFB0000-0x0000000040494000-memory.dmp

Filesize
4.9MB

Download
memory/4324-141-0x000000003FFB0000-0x0000000040494000-memory.dmp

Filesize
4.9MB

Download
memory/4324-142-0x000000003FFB0000-0x0000000040494000-memory.dmp

Filesize
4.9MB

Download
memory/4324-143-0x000000003FFB0000-0x0000000040494000-memory.dmp

Filesize
4.9MB

Download
memory/4324-140-0x0000000077220000-0x00000000773C3000-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