buer | 6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d

General

Target

6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d.exe
Size

2.0MB
MD5

abd4e9aad8ec61897613808a95b86a7a
SHA1

d1962d200b9d79e5e9197050e7f1134c0bd1b22b
SHA256

6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d
SHA512

42ca936d21a3995f7ba408915d1a9d20a1a5c18e19e4154755ac9e9c8ade80b90ca0daa487247dd3749301a59279864d67d5cd3b7e6c1aa3d7507c995c7edca3

Score

10^/10

buer evasion loader persistence

Malware Config

Extracted

Family

buer

C2

http://loy01.top/

http://loy02.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-1-5-21-2660308776-3705150086-26593515-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\UBlockPlugin\\plugin.exe\""	plugin.exe

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/396-134-0x000000003FC90000-0x000000004017D000-memory.dmp	buer
behavioral2/memory/4880-139-0x000000003F7A0000-0x000000003FC8D000-memory.dmp	buer
behavioral2/memory/4880-140-0x000000003F7A0000-0x000000003FC8D000-memory.dmp	buer
behavioral2/memory/4880-142-0x000000003F7A0000-0x000000003FC8D000-memory.dmp	buer

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

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	plugin.exe

Executes dropped EXE 1 IoCs

pid	Process
4880	plugin.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	6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	plugin.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	plugin.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-1-5-21-2660308776-3705150086-26593515-1000\Software\Wine	6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d.exe
Key opened	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\Software\Wine	plugin.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
396	6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d.exe
4880	plugin.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4052	4140	WerFault.exe	83

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
396	6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d.exe
396	6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d.exe
4880	plugin.exe
4880	plugin.exe
4880	plugin.exe
4880	plugin.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 396 wrote to memory of 4880	396	6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d.exe	82
PID 396 wrote to memory of 4880	396	6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d.exe	82
PID 396 wrote to memory of 4880	396	6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d.exe	82
PID 4880 wrote to memory of 4140	4880	plugin.exe	83
PID 4880 wrote to memory of 4140	4880	plugin.exe	83
PID 4880 wrote to memory of 4140	4880	plugin.exe	83
PID 4880 wrote to memory of 4140	4880	plugin.exe	83
PID 4880 wrote to memory of 4140	4880	plugin.exe	83
PID 4880 wrote to memory of 4140	4880	plugin.exe	83
PID 4880 wrote to memory of 4140	4880	plugin.exe	83
PID 4880 wrote to memory of 4140	4880	plugin.exe	83
PID 4880 wrote to memory of 4140	4880	plugin.exe	83
PID 4880 wrote to memory of 4140	4880	plugin.exe	83
PID 4880 wrote to memory of 4140	4880	plugin.exe	83
PID 4880 wrote to memory of 4140	4880	plugin.exe	83

C:\Users\Admin\AppData\Local\Temp\6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d.exe
"C:\Users\Admin\AppData\Local\Temp\6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:396
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - 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:4880
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:4140
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4140 -s 188
      4⤵
      Program crash
      PID:4052

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 360 -p 4140 -ip 4140
1⤵
PID:408

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\UBlockPlugin\plugin.exe

Filesize
2.0MB

MD5
abd4e9aad8ec61897613808a95b86a7a

SHA1
d1962d200b9d79e5e9197050e7f1134c0bd1b22b

SHA256
6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d

SHA512
42ca936d21a3995f7ba408915d1a9d20a1a5c18e19e4154755ac9e9c8ade80b90ca0daa487247dd3749301a59279864d67d5cd3b7e6c1aa3d7507c995c7edca3

Download Submit
C:\ProgramData\UBlockPlugin\plugin.exe

Filesize
2.0MB

MD5
abd4e9aad8ec61897613808a95b86a7a

SHA1
d1962d200b9d79e5e9197050e7f1134c0bd1b22b

SHA256
6a57777ca59bc1e671ed7d78d6919e7a978eab31eb4f7ddd6d04d8d020a1fc9d

SHA512
42ca936d21a3995f7ba408915d1a9d20a1a5c18e19e4154755ac9e9c8ade80b90ca0daa487247dd3749301a59279864d67d5cd3b7e6c1aa3d7507c995c7edca3

Download Submit
memory/396-130-0x000000003FC90000-0x000000004017D000-memory.dmp

Filesize
4.9MB

Download
memory/396-134-0x000000003FC90000-0x000000004017D000-memory.dmp

Filesize
4.9MB

Download
memory/396-135-0x0000000077C20000-0x0000000077DC3000-memory.dmp

Filesize
1.6MB

Download
memory/4880-136-0x000000003F7A0000-0x000000003FC8D000-memory.dmp

Filesize
4.9MB

Download
memory/4880-138-0x0000000077C20000-0x0000000077DC3000-memory.dmp

Filesize
1.6MB

Download
memory/4880-139-0x000000003F7A0000-0x000000003FC8D000-memory.dmp

Filesize
4.9MB

Download
memory/4880-140-0x000000003F7A0000-0x000000003FC8D000-memory.dmp

Filesize
4.9MB

Download
memory/4880-141-0x0000000077C20000-0x0000000077DC3000-memory.dmp

Filesize
1.6MB

Download
memory/4880-142-0x000000003F7A0000-0x000000003FC8D000-memory.dmp

Filesize
4.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads