buer | 1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa

General

Target

1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe
Size

1.7MB
MD5

5052bb8fdec5fed9db55c44c11cfc568
SHA1

a5b781562d536aeb098113257641b704c2d18715
SHA256

1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa
SHA512

1cef862fb24e26f37167fe385e47a5c22fc7f2a011315b9a019203ac94e651084d6cf059d0db7f0b1ef7a917cfdad8a3f56bf727a6c6178e0610c261b4a194fa

Score

10^/10

buer evasion loader persistence

Malware Config

Extracted

Family

buer

C2

http://kload01.info/

http://kload02.info/

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-1-5-21-1081944012-3634099177-1681222835-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\UBlockPlugin\\plugin.exe\""	plugin.exe

Buer Loader 7 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/2380-132-0x000000003FFA0000-0x00000000403EB000-memory.dmp	buer
behavioral2/memory/2380-133-0x000000003FFA0000-0x00000000403EB000-memory.dmp	buer
behavioral2/memory/2380-134-0x000000003FFA0000-0x00000000403EB000-memory.dmp	buer
behavioral2/memory/2380-138-0x000000003FFA0000-0x00000000403EB000-memory.dmp	buer
behavioral2/memory/1452-142-0x000000003F900000-0x000000003FD4B000-memory.dmp	buer
behavioral2/memory/1452-143-0x000000003F900000-0x000000003FD4B000-memory.dmp	buer
behavioral2/memory/1452-144-0x000000003F900000-0x000000003FD4B000-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__	1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	plugin.exe

Executes dropped EXE 1 IoCs

pid	Process
1452	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	1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.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-1-5-21-1081944012-3634099177-1681222835-1000\Software\Wine	1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe
Key opened	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Software\Wine	plugin.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2380	1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe
1452	plugin.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4756	4324	WerFault.exe	88

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2380	1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe
2380	1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe
1452	plugin.exe
1452	plugin.exe
1452	plugin.exe
1452	plugin.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2380 wrote to memory of 1452	2380	1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe	85
PID 2380 wrote to memory of 1452	2380	1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe	85
PID 2380 wrote to memory of 1452	2380	1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe	85
PID 1452 wrote to memory of 4324	1452	plugin.exe	88
PID 1452 wrote to memory of 4324	1452	plugin.exe	88
PID 1452 wrote to memory of 4324	1452	plugin.exe	88
PID 1452 wrote to memory of 4324	1452	plugin.exe	88
PID 1452 wrote to memory of 4324	1452	plugin.exe	88
PID 1452 wrote to memory of 4324	1452	plugin.exe	88
PID 1452 wrote to memory of 4324	1452	plugin.exe	88
PID 1452 wrote to memory of 4324	1452	plugin.exe	88
PID 1452 wrote to memory of 4324	1452	plugin.exe	88
PID 1452 wrote to memory of 4324	1452	plugin.exe	88
PID 1452 wrote to memory of 4324	1452	plugin.exe	88
PID 1452 wrote to memory of 4324	1452	plugin.exe	88

C:\Users\Admin\AppData\Local\Temp\1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe
"C:\Users\Admin\AppData\Local\Temp\1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.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:2380
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.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:1452
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:4324
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4324 -s 176
      4⤵
      Program crash
      PID:4756

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 4324 -ip 4324
1⤵
PID:3532

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
1.7MB

MD5
5052bb8fdec5fed9db55c44c11cfc568

SHA1
a5b781562d536aeb098113257641b704c2d18715

SHA256
1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa

SHA512
1cef862fb24e26f37167fe385e47a5c22fc7f2a011315b9a019203ac94e651084d6cf059d0db7f0b1ef7a917cfdad8a3f56bf727a6c6178e0610c261b4a194fa

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

Filesize
1.7MB

MD5
5052bb8fdec5fed9db55c44c11cfc568

SHA1
a5b781562d536aeb098113257641b704c2d18715

SHA256
1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa

SHA512
1cef862fb24e26f37167fe385e47a5c22fc7f2a011315b9a019203ac94e651084d6cf059d0db7f0b1ef7a917cfdad8a3f56bf727a6c6178e0610c261b4a194fa

Download Submit
memory/1452-140-0x000000003F900000-0x000000003FD4B000-memory.dmp

Filesize
4.3MB

Download
memory/1452-144-0x000000003F900000-0x000000003FD4B000-memory.dmp

Filesize
4.3MB

Download
memory/1452-143-0x000000003F900000-0x000000003FD4B000-memory.dmp

Filesize
4.3MB

Download
memory/1452-142-0x000000003F900000-0x000000003FD4B000-memory.dmp

Filesize
4.3MB

Download
memory/1452-141-0x0000000077990000-0x0000000077B33000-memory.dmp

Filesize
1.6MB

Download
memory/2380-134-0x000000003FFA0000-0x00000000403EB000-memory.dmp

Filesize
4.3MB

Download
memory/2380-139-0x0000000077990000-0x0000000077B33000-memory.dmp

Filesize
1.6MB

Download
memory/2380-138-0x000000003FFA0000-0x00000000403EB000-memory.dmp

Filesize
4.3MB

Download
memory/2380-130-0x000000003FFA0000-0x00000000403EB000-memory.dmp

Filesize
4.3MB

Download
memory/2380-133-0x000000003FFA0000-0x00000000403EB000-memory.dmp

Filesize
4.3MB

Download
memory/2380-132-0x000000003FFA0000-0x00000000403EB000-memory.dmp

Filesize
4.3MB

Download
memory/2380-131-0x0000000077990000-0x0000000077B33000-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