buer | d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f

General

Target

d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f.exe
Size

2.0MB
MD5

e841f039dd3583e617ffe376df63b87c
SHA1

d8d998f26b3b73a0631824d1336a25f6f14b7e84
SHA256

d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f
SHA512

7b9e80d8d0c614476f81a1cdfa4a341e39e25dc75708a6c18c695e27afe965eb931055e9cd66d730d53e5a9d0665c5d0f2ed0e438f6c1b03190608a6de2f6380

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-1-5-21-1101907861-274115917-2188613224-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\UBlockPlugin\\plugin.exe\""	plugin.exe

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/1996-132-0x000000003F640000-0x000000003FB23000-memory.dmp	buer
behavioral2/memory/1040-138-0x000000003FD90000-0x0000000040273000-memory.dmp	buer
behavioral2/memory/1040-141-0x000000003FD90000-0x0000000040273000-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__	d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	plugin.exe

Executes dropped EXE 1 IoCs

pid	Process
1040	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	d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f.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-1-5-21-1101907861-274115917-2188613224-1000\Software\Wine	d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f.exe
Key opened	\REGISTRY\USER\S-1-5-21-1101907861-274115917-2188613224-1000\Software\Wine	plugin.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1996	d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f.exe
1040	plugin.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4400	4396	WerFault.exe	82

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1996	d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f.exe
1996	d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f.exe
1040	plugin.exe
1040	plugin.exe
1040	plugin.exe
1040	plugin.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1996 wrote to memory of 1040	1996	d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f.exe	81
PID 1996 wrote to memory of 1040	1996	d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f.exe	81
PID 1996 wrote to memory of 1040	1996	d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f.exe	81
PID 1040 wrote to memory of 4396	1040	plugin.exe	82
PID 1040 wrote to memory of 4396	1040	plugin.exe	82
PID 1040 wrote to memory of 4396	1040	plugin.exe	82
PID 1040 wrote to memory of 4396	1040	plugin.exe	82
PID 1040 wrote to memory of 4396	1040	plugin.exe	82
PID 1040 wrote to memory of 4396	1040	plugin.exe	82
PID 1040 wrote to memory of 4396	1040	plugin.exe	82
PID 1040 wrote to memory of 4396	1040	plugin.exe	82
PID 1040 wrote to memory of 4396	1040	plugin.exe	82
PID 1040 wrote to memory of 4396	1040	plugin.exe	82
PID 1040 wrote to memory of 4396	1040	plugin.exe	82
PID 1040 wrote to memory of 4396	1040	plugin.exe	82

C:\Users\Admin\AppData\Local\Temp\d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f.exe
"C:\Users\Admin\AppData\Local\Temp\d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f.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:1996
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f.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:1040
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:4396
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4396 -s 220
      4⤵
      Program crash
      PID:4400

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 4396 -ip 4396
1⤵
PID:4212

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
e841f039dd3583e617ffe376df63b87c

SHA1
d8d998f26b3b73a0631824d1336a25f6f14b7e84

SHA256
d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f

SHA512
7b9e80d8d0c614476f81a1cdfa4a341e39e25dc75708a6c18c695e27afe965eb931055e9cd66d730d53e5a9d0665c5d0f2ed0e438f6c1b03190608a6de2f6380

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

Filesize
2.0MB

MD5
e841f039dd3583e617ffe376df63b87c

SHA1
d8d998f26b3b73a0631824d1336a25f6f14b7e84

SHA256
d1d93897a3378eb32b943ef3010f9af53246cb90e125668d080a28ec676b332f

SHA512
7b9e80d8d0c614476f81a1cdfa4a341e39e25dc75708a6c18c695e27afe965eb931055e9cd66d730d53e5a9d0665c5d0f2ed0e438f6c1b03190608a6de2f6380

Download Submit
memory/1040-137-0x0000000077A80000-0x0000000077C23000-memory.dmp

Filesize
1.6MB

Download
memory/1040-138-0x000000003FD90000-0x0000000040273000-memory.dmp

Filesize
4.9MB

Download
memory/1040-140-0x0000000077A80000-0x0000000077C23000-memory.dmp

Filesize
1.6MB

Download
memory/1040-141-0x000000003FD90000-0x0000000040273000-memory.dmp

Filesize
4.9MB

Download
memory/1996-130-0x000000003F640000-0x000000003FB23000-memory.dmp

Filesize
4.9MB

Download
memory/1996-131-0x0000000077A80000-0x0000000077C23000-memory.dmp

Filesize
1.6MB

Download
memory/1996-132-0x000000003F640000-0x000000003FB23000-memory.dmp

Filesize
4.9MB

Download
memory/1996-136-0x0000000077A80000-0x0000000077C23000-memory.dmp

Filesize
1.6MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads