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-1-5-21-1083475884-596052423-1669053738-1000\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
behavioral1/memory/1660-56-0x000000003FA60000-0x000000003FEE4000-memory.dmp	buer
behavioral1/memory/1204-61-0x000000003FC80000-0x0000000040104000-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
1204	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	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe
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	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe

Deletes itself 1 IoCs

pid	Process
1204	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-1-5-21-1083475884-596052423-1669053738-1000\Software\Wine	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe
Key opened	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Wine	errorResponder.exe

Loads dropped DLL 1 IoCs

pid	Process
1660	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1660	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe
1204	errorResponder.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1660	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe
1204	errorResponder.exe
1204	errorResponder.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1660 wrote to memory of 1204	1660	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe	28
PID 1660 wrote to memory of 1204	1660	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe	28
PID 1660 wrote to memory of 1204	1660	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe	28
PID 1660 wrote to memory of 1204	1660	3d8b7ed35de4a807e9c9b04aaf0f99eb1cd46a9de1970af140ac048d6e2f5367.exe	28
PID 1204 wrote to memory of 1356	1204	errorResponder.exe	29
PID 1204 wrote to memory of 1356	1204	errorResponder.exe	29
PID 1204 wrote to memory of 1356	1204	errorResponder.exe	29
PID 1204 wrote to memory of 1356	1204	errorResponder.exe	29

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
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1660
- 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
  - Deletes itself
  - Identifies Wine through registry keys
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1204
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\ErrorResponder\errorResponder.exe
    3⤵
    PID:1356

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
1.4MB

MD5
e40cd17d149719b57af22407157446d3

SHA1
1b73a4aaecf31e25c6dafd0c48ba91329b2a1f81

SHA256
0eb1b32f98f8d9b7addc3e15e3f6b20168a248cee38759917d9f0446ae67e1c5

SHA512
8f3aa6b93dd8c091a4bd8337901557063639339ead21e10fa1c1db1bbcaab8e83808ff0e316d803cde7ea41d9a9b9c8b302569d422ec65224ab9ddb2261d58c9

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

Filesize
319KB

MD5
36193bcaa2a9f72e454291ca1fb1370e

SHA1
3dc8dd8b88e9408b616fe0aa135754ac6b993f52

SHA256
8ca56d66ff70264fffb4d96b6faab79cb420aed7c54f9c180aa700ae6ba55662

SHA512
8b266018abf2e66d9a5ae3cb76e35705f596d087a3308b4f1d338a3bcc115286276b36f43179fea6d1007ebcdcf4d6d69a56c1e0fd891b09eb390f2376fee9f3

Download Submit
\ProgramData\ErrorResponder\errorResponder.exe

Filesize
1.1MB

MD5
49587e24ff25a9470c27494c9b3f8fa7

SHA1
b755cd214cc8bbdc5111a8e3dddabe1f7554721d

SHA256
8f44e10e8340295f0ea482b98e249d89182a361670eb7e3752fc969866beda69

SHA512
9d43d09741e8d89933c0d319fc37c1f9ffac3505b8b84b950b63ad1ed29c614e03543fc460d89ed14c666378199b2c20c71efa77c9b43b572fee2483e19be7d8

Download Submit
memory/1204-61-0x000000003FC80000-0x0000000040104000-memory.dmp

Filesize
4.5MB

Download
memory/1660-54-0x00000000765F1000-0x00000000765F3000-memory.dmp

Filesize
8KB

Download
memory/1660-55-0x0000000077E10000-0x0000000077F90000-memory.dmp

Filesize
1.5MB

Download
memory/1660-56-0x000000003FA60000-0x000000003FEE4000-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