buer | 30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49

General

Target

30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49.exe
Size

1.9MB
MD5

b707d0f456635a8dab39a90bb561e89f
SHA1

4acf51810471b9a2b567e17b7b8f624f6271ac92
SHA256

30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49
SHA512

73ea8547a712594173220dcb5631f86d900f42cacbe1e1e988680753b3cac04a67ef554f282029fce3c3ed8a91a7de794961f60b47c8ea9a4429709da6b38b65

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/5104-131-0x000000003FB60000-0x0000000040023000-memory.dmp	buer
behavioral2/memory/204-136-0x000000003F6A0000-0x000000003FB63000-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
204	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	30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49.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	30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49.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
5104	30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49.exe
204	errorResponder.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
2428	5028	WerFault.exe	87
2828	5028	WerFault.exe	87

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
5104	30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49.exe
5104	30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49.exe
204	errorResponder.exe
204	errorResponder.exe
204	errorResponder.exe
204	errorResponder.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 5104 wrote to memory of 204	5104	30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49.exe	86
PID 5104 wrote to memory of 204	5104	30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49.exe	86
PID 5104 wrote to memory of 204	5104	30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49.exe	86
PID 204 wrote to memory of 5028	204	errorResponder.exe	87
PID 204 wrote to memory of 5028	204	errorResponder.exe	87
PID 204 wrote to memory of 5028	204	errorResponder.exe	87
PID 204 wrote to memory of 5028	204	errorResponder.exe	87
PID 204 wrote to memory of 5028	204	errorResponder.exe	87
PID 204 wrote to memory of 5028	204	errorResponder.exe	87
PID 204 wrote to memory of 5028	204	errorResponder.exe	87
PID 204 wrote to memory of 5028	204	errorResponder.exe	87
PID 204 wrote to memory of 5028	204	errorResponder.exe	87
PID 204 wrote to memory of 5028	204	errorResponder.exe	87
PID 204 wrote to memory of 5028	204	errorResponder.exe	87
PID 204 wrote to memory of 5028	204	errorResponder.exe	87

C:\Users\Admin\AppData\Local\Temp\30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49.exe
"C:\Users\Admin\AppData\Local\Temp\30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49.exe"
1⤵
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:5104
- C:\ProgramData\ErrorResponder\errorResponder.exe
  C:\ProgramData\ErrorResponder\errorResponder.exe "C:\Users\Admin\AppData\Local\Temp\30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49.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:204
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\ErrorResponder\errorResponder.exe
    3⤵
    PID:5028
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5028 -s 260
      4⤵
      Program crash
      PID:2428
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5028 -s 280
      4⤵
      Program crash
      PID:2828

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 5028 -ip 5028
1⤵
PID:4500

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 552 -p 5028 -ip 5028
1⤵
PID:2300

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
1.9MB

MD5
b707d0f456635a8dab39a90bb561e89f

SHA1
4acf51810471b9a2b567e17b7b8f624f6271ac92

SHA256
30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49

SHA512
73ea8547a712594173220dcb5631f86d900f42cacbe1e1e988680753b3cac04a67ef554f282029fce3c3ed8a91a7de794961f60b47c8ea9a4429709da6b38b65

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

Filesize
1.9MB

MD5
b707d0f456635a8dab39a90bb561e89f

SHA1
4acf51810471b9a2b567e17b7b8f624f6271ac92

SHA256
30f5f3d2af768cf4eb2dc9fa7508264caffb8acdc623c38bf72ef6f2d89a9d49

SHA512
73ea8547a712594173220dcb5631f86d900f42cacbe1e1e988680753b3cac04a67ef554f282029fce3c3ed8a91a7de794961f60b47c8ea9a4429709da6b38b65

Download Submit
memory/204-135-0x0000000076F70000-0x0000000077113000-memory.dmp

Filesize
1.6MB

Download
memory/204-136-0x000000003F6A0000-0x000000003FB63000-memory.dmp

Filesize
4.8MB

Download
memory/5028-138-0x0000000000A20000-0x0000000000EE3000-memory.dmp

Filesize
4.8MB

Download
memory/5104-130-0x0000000076F70000-0x0000000077113000-memory.dmp

Filesize
1.6MB

Download
memory/5104-131-0x000000003FB60000-0x0000000040023000-memory.dmp

Filesize
4.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads