buer | 3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367

General

Target

3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe
Size

1.8MB
MD5

820f5bd213f5ff673013f29e6bdc114e
SHA1

62adcd3c613a978648daa640febf4d403fbeffb4
SHA256

3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367
SHA512

98825fe6143b108928f3d849533c768495efd120d0cfb70292c9e6e3a553edca74fdb091948c30185a721d72fb994a6d092f0966d5cc18bbdc2d7aaf84754e1d

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 2 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/1792-131-0x000000003F4D0000-0x000000003F954000-memory.dmp	buer
behavioral2/memory/1800-136-0x000000003FA30000-0x000000003FEB4000-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
1800	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	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.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-1-5-21-2632097139-1792035885-811742494-1000\Software\Wine	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe
Key opened	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Software\Wine	errorResponder.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1792	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe
1800	errorResponder.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3040	2008	WerFault.exe	87

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1792	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe
1792	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe
1800	errorResponder.exe
1800	errorResponder.exe
1800	errorResponder.exe
1800	errorResponder.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1792 wrote to memory of 1800	1792	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe	86
PID 1792 wrote to memory of 1800	1792	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe	86
PID 1792 wrote to memory of 1800	1792	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe	86
PID 1800 wrote to memory of 2008	1800	errorResponder.exe	87
PID 1800 wrote to memory of 2008	1800	errorResponder.exe	87
PID 1800 wrote to memory of 2008	1800	errorResponder.exe	87
PID 1800 wrote to memory of 2008	1800	errorResponder.exe	87
PID 1800 wrote to memory of 2008	1800	errorResponder.exe	87
PID 1800 wrote to memory of 2008	1800	errorResponder.exe	87
PID 1800 wrote to memory of 2008	1800	errorResponder.exe	87
PID 1800 wrote to memory of 2008	1800	errorResponder.exe	87
PID 1800 wrote to memory of 2008	1800	errorResponder.exe	87
PID 1800 wrote to memory of 2008	1800	errorResponder.exe	87
PID 1800 wrote to memory of 2008	1800	errorResponder.exe	87
PID 1800 wrote to memory of 2008	1800	errorResponder.exe	87

C:\Users\Admin\AppData\Local\Temp\3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe
"C:\Users\Admin\AppData\Local\Temp\3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe"
1⤵
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1792
- C:\ProgramData\ErrorResponder\errorResponder.exe
  C:\ProgramData\ErrorResponder\errorResponder.exe "C:\Users\Admin\AppData\Local\Temp\3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.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:1800
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\ErrorResponder\errorResponder.exe
    3⤵
    PID:2008
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2008 -s 288
      4⤵
      Program crash
      PID:3040

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2008 -ip 2008
1⤵
PID:2128

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
618KB

MD5
9e551520bad4023c6f238028c4b2c61d

SHA1
b1a9a51dda72a96a7dbe404b8037fb2eeed621df

SHA256
e2c34f50eba4dab63329238e2a2ce7aafc4cbf39dfa5b9ff50053557e08fb33a

SHA512
1fd7d5902ae85a6afa1c08eaad59c8e8b18f26cea807f8b337a2da7b786e056b819479dc04b731bad9c15cbebc807bc90ae780538fbd25c0829508e72659dea1

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

Filesize
1.1MB

MD5
88e11919e2b1890ddaf9133d92e5d801

SHA1
8a64c130ccdac17fde88968a3ab130f0c71919d7

SHA256
fbc3ef142d2b0f1c9d850048f59f34318c1bf407720cebe46fc76a872b994dd6

SHA512
50d732f3ecac37582ca719ebe13cc626cf855acc380c4e51c018374fd631f141623b16ea8745f380b77c5db37cd2edfcf7527e62c0e31d5c30b7eac89c449768

Download Submit
memory/1792-130-0x0000000077DC0000-0x0000000077F63000-memory.dmp

Filesize
1.6MB

Download
memory/1792-131-0x000000003F4D0000-0x000000003F954000-memory.dmp

Filesize
4.5MB

Download
memory/1800-135-0x0000000077DC0000-0x0000000077F63000-memory.dmp

Filesize
1.6MB

Download
memory/1800-136-0x000000003FA30000-0x000000003FEB4000-memory.dmp

Filesize
4.5MB

Download
memory/2008-138-0x0000000000400000-0x0000000000884000-memory.dmp

Filesize
4.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads