buer | 014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f

General

Target
014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f.exe
Size 1.8MB
Sample220523-zb6sbafdf5
SHA256 014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f
MD5 e91cc94bcf70a4cd3a8f8c7df1bf88fa
SHA1 2ac449ecfca9d525b8b65da6c47a5525c0fe48b9
SHA512 964dc41bbd55e571562f2c2d7f8c738efb1b31a9ff69d153d8e1af6c435080da65712641bbe7a69d5effff1a0defa20ebdf81670c7260ce3c5b590c09a4cb0c1
MD5 SHA1 SHA512

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 2 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/1860-131-0x000000003FC70000-0x00000000400F0000-memory.dmp	buer
behavioral2/memory/1528-136-0x000000003F200000-0x000000003F680000-memory.dmp	buer

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Executes dropped EXE 1 IoCs

pid	Process
1528	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	014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f.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	014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f.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
1860	014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f.exe
1528	errorResponder.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
4500	3408	WerFault.exe	90
3880	3408	WerFault.exe	90

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1860	014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f.exe
1860	014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f.exe
1528	errorResponder.exe
1528	errorResponder.exe
1528	errorResponder.exe
1528	errorResponder.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1860 wrote to memory of 1528	1860	014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f.exe	89
PID 1860 wrote to memory of 1528	1860	014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f.exe	89
PID 1860 wrote to memory of 1528	1860	014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f.exe	89
PID 1528 wrote to memory of 3408	1528	errorResponder.exe	90
PID 1528 wrote to memory of 3408	1528	errorResponder.exe	90
PID 1528 wrote to memory of 3408	1528	errorResponder.exe	90
PID 1528 wrote to memory of 3408	1528	errorResponder.exe	90
PID 1528 wrote to memory of 3408	1528	errorResponder.exe	90
PID 1528 wrote to memory of 3408	1528	errorResponder.exe	90
PID 1528 wrote to memory of 3408	1528	errorResponder.exe	90
PID 1528 wrote to memory of 3408	1528	errorResponder.exe	90
PID 1528 wrote to memory of 3408	1528	errorResponder.exe	90
PID 1528 wrote to memory of 3408	1528	errorResponder.exe	90
PID 1528 wrote to memory of 3408	1528	errorResponder.exe	90
PID 1528 wrote to memory of 3408	1528	errorResponder.exe	90

C:\Users\Admin\AppData\Local\Temp\014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f.exe
"C:\Users\Admin\AppData\Local\Temp\014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f.exe"
1⤵
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1860
- C:\ProgramData\ErrorResponder\errorResponder.exe
  C:\ProgramData\ErrorResponder\errorResponder.exe "C:\Users\Admin\AppData\Local\Temp\014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - 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:1528
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\ErrorResponder\errorResponder.exe
    3⤵
    PID:3408
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3408 -s 260
      4⤵
      Program crash
      PID:4500
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3408 -s 316
      4⤵
      Program crash
      PID:3880

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3408 -ip 3408
1⤵
PID:5104

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 3408 -ip 3408
1⤵
PID:3364

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

errorResponder.exe

Path C:\ProgramData\ErrorResponder\errorResponder.exe
Size 1.8MB
SHA256 014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f
MD5 e91cc94bcf70a4cd3a8f8c7df1bf88fa
SHA1 2ac449ecfca9d525b8b65da6c47a5525c0fe48b9
SHA512 964dc41bbd55e571562f2c2d7f8c738efb1b31a9ff69d153d8e1af6c435080da65712641bbe7a69d5effff1a0defa20ebdf81670c7260ce3c5b590c09a4cb0c1
SSDEEP 49152:GLftJlJ+XnNHogttWcDRzOEtZuFno0ezgLMF1MSR4aK7:ItihoEtWsgSY5vHMES6aK7
MD5 SHA1 SHA512 SSDEEP

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errorResponder.exe

Path C:\ProgramData\ErrorResponder\errorResponder.exe
Size 1.8MB
SHA256 014a00ff4eb8eabdd9a7e2e0a0d322cfab2cd2a0f65855e98eef290b217d7c8f
MD5 e91cc94bcf70a4cd3a8f8c7df1bf88fa
SHA1 2ac449ecfca9d525b8b65da6c47a5525c0fe48b9
SHA512 964dc41bbd55e571562f2c2d7f8c738efb1b31a9ff69d153d8e1af6c435080da65712641bbe7a69d5effff1a0defa20ebdf81670c7260ce3c5b590c09a4cb0c1
SSDEEP 49152:GLftJlJ+XnNHogttWcDRzOEtZuFno0ezgLMF1MSR4aK7:ItihoEtWsgSY5vHMES6aK7
MD5 SHA1 SHA512 SSDEEP

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memory/1528-135-0x00000000772E0000-0x0000000077483000-memory.dmp

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memory/1528-136-0x000000003F200000-0x000000003F680000-memory.dmp

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memory/1860-130-0x00000000772E0000-0x0000000077483000-memory.dmp

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memory/1860-131-0x000000003FC70000-0x00000000400F0000-memory.dmp

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memory/3408-138-0x00000000006C0000-0x0000000000B40000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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