buer | 0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d

General

Target

0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d.exe
Size

1.8MB
MD5

adf78598e169ce6d27a36eac18206935
SHA1

ade6bd5e962fbaa0c35062863c14ddc371d64ba7
SHA256

0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d
SHA512

c90c747f5b6d756884746dfcfb347a45e71382b2f25f610700e7490839a920bf24741bb7e6f832abd67ded3aa89bbb935c38835b705b5d6b5df28bc71957c627

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/4640-131-0x000000003F9A0000-0x000000003FE33000-memory.dmp	buer
behavioral2/memory/2100-135-0x000000003F560000-0x000000003F9F3000-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
2100	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	errorResponder.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	errorResponder.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d.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	0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d.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
4640	0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d.exe
2100	errorResponder.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
4472	904	WerFault.exe	99
1704	904	WerFault.exe	99

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4640	0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d.exe
4640	0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d.exe
2100	errorResponder.exe
2100	errorResponder.exe
2100	errorResponder.exe
2100	errorResponder.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4640 wrote to memory of 2100	4640	0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d.exe	98
PID 4640 wrote to memory of 2100	4640	0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d.exe	98
PID 4640 wrote to memory of 2100	4640	0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d.exe	98
PID 2100 wrote to memory of 904	2100	errorResponder.exe	99
PID 2100 wrote to memory of 904	2100	errorResponder.exe	99
PID 2100 wrote to memory of 904	2100	errorResponder.exe	99
PID 2100 wrote to memory of 904	2100	errorResponder.exe	99
PID 2100 wrote to memory of 904	2100	errorResponder.exe	99
PID 2100 wrote to memory of 904	2100	errorResponder.exe	99
PID 2100 wrote to memory of 904	2100	errorResponder.exe	99
PID 2100 wrote to memory of 904	2100	errorResponder.exe	99
PID 2100 wrote to memory of 904	2100	errorResponder.exe	99
PID 2100 wrote to memory of 904	2100	errorResponder.exe	99
PID 2100 wrote to memory of 904	2100	errorResponder.exe	99
PID 2100 wrote to memory of 904	2100	errorResponder.exe	99

C:\Users\Admin\AppData\Local\Temp\0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d.exe
"C:\Users\Admin\AppData\Local\Temp\0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d.exe"
1⤵
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4640
- C:\ProgramData\ErrorResponder\errorResponder.exe
  C:\ProgramData\ErrorResponder\errorResponder.exe "C:\Users\Admin\AppData\Local\Temp\0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d.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:2100
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\ErrorResponder\errorResponder.exe
    3⤵
    PID:904
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 904 -s 272
      4⤵
      Program crash
      PID:4472
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 904 -s 312
      4⤵
      Program crash
      PID:1704

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 904 -ip 904
1⤵
PID:2160

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 904 -ip 904
1⤵
PID:4188

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
1.8MB

MD5
adf78598e169ce6d27a36eac18206935

SHA1
ade6bd5e962fbaa0c35062863c14ddc371d64ba7

SHA256
0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d

SHA512
c90c747f5b6d756884746dfcfb347a45e71382b2f25f610700e7490839a920bf24741bb7e6f832abd67ded3aa89bbb935c38835b705b5d6b5df28bc71957c627

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

Filesize
1.8MB

MD5
adf78598e169ce6d27a36eac18206935

SHA1
ade6bd5e962fbaa0c35062863c14ddc371d64ba7

SHA256
0a063bb3197ef0ac5a791d0eb27f520091886037c12a0b3654f7c7b68381d72d

SHA512
c90c747f5b6d756884746dfcfb347a45e71382b2f25f610700e7490839a920bf24741bb7e6f832abd67ded3aa89bbb935c38835b705b5d6b5df28bc71957c627

Download Submit
memory/904-138-0x00000000004B0000-0x0000000000943000-memory.dmp

Filesize
4.6MB

Download
memory/2100-134-0x00000000775A0000-0x0000000077743000-memory.dmp

Filesize
1.6MB

Download
memory/2100-135-0x000000003F560000-0x000000003F9F3000-memory.dmp

Filesize
4.6MB

Download
memory/4640-130-0x00000000775A0000-0x0000000077743000-memory.dmp

Filesize
1.6MB

Download
memory/4640-131-0x000000003F9A0000-0x000000003FE33000-memory.dmp

Filesize
4.6MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads