buer | 95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc

General

Target

95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc.exe
Size

1.6MB
MD5

d84fc8f135bbf515b8f99412b58fe5b1
SHA1

5707a9ab80925f288f0fcbf0b211d0f2801c595e
SHA256

95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc
SHA512

8f2173c34e7db6700e8c4c4683789a5658a9d27ca3bb921872454d75b6c360f89b5b593d4d258d97fd1b7fc00c99587ebf67235b32e30a58010d1ca7b70d92c6

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-1-5-21-3751123196-3323558407-1869646069-1000\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/4776-132-0x000000003FF70000-0x00000000403A9000-memory.dmp	buer
behavioral2/memory/4776-133-0x000000003FF70000-0x00000000403A9000-memory.dmp	buer
behavioral2/memory/4776-134-0x000000003FF70000-0x00000000403A9000-memory.dmp	buer
behavioral2/memory/4776-138-0x000000003FF70000-0x00000000403A9000-memory.dmp	buer
behavioral2/memory/4548-142-0x000000003F700000-0x000000003FB39000-memory.dmp	buer
behavioral2/memory/4548-143-0x000000003F700000-0x000000003FB39000-memory.dmp	buer
behavioral2/memory/4548-144-0x000000003F700000-0x000000003FB39000-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__	95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	plugin.exe

Executes dropped EXE 1 IoCs

pid	Process
4548	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\VideoBiosVersion	plugin.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	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-1-5-21-3751123196-3323558407-1869646069-1000\Software\Wine	95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc.exe
Key opened	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Software\Wine	plugin.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4776	95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc.exe
4548	plugin.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4612	988	WerFault.exe	84

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4776	95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc.exe
4776	95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc.exe
4548	plugin.exe
4548	plugin.exe
4548	plugin.exe
4548	plugin.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4776 wrote to memory of 4548	4776	95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc.exe	82
PID 4776 wrote to memory of 4548	4776	95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc.exe	82
PID 4776 wrote to memory of 4548	4776	95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc.exe	82
PID 4548 wrote to memory of 988	4548	plugin.exe	84
PID 4548 wrote to memory of 988	4548	plugin.exe	84
PID 4548 wrote to memory of 988	4548	plugin.exe	84
PID 4548 wrote to memory of 988	4548	plugin.exe	84
PID 4548 wrote to memory of 988	4548	plugin.exe	84
PID 4548 wrote to memory of 988	4548	plugin.exe	84
PID 4548 wrote to memory of 988	4548	plugin.exe	84
PID 4548 wrote to memory of 988	4548	plugin.exe	84
PID 4548 wrote to memory of 988	4548	plugin.exe	84
PID 4548 wrote to memory of 988	4548	plugin.exe	84
PID 4548 wrote to memory of 988	4548	plugin.exe	84
PID 4548 wrote to memory of 988	4548	plugin.exe	84

C:\Users\Admin\AppData\Local\Temp\95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc.exe
"C:\Users\Admin\AppData\Local\Temp\95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc.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:4776
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc.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:4548
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:988
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 988 -s 232
      4⤵
      Program crash
      PID:4612

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 988 -ip 988
1⤵
PID:4896

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
1.6MB

MD5
d84fc8f135bbf515b8f99412b58fe5b1

SHA1
5707a9ab80925f288f0fcbf0b211d0f2801c595e

SHA256
95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc

SHA512
8f2173c34e7db6700e8c4c4683789a5658a9d27ca3bb921872454d75b6c360f89b5b593d4d258d97fd1b7fc00c99587ebf67235b32e30a58010d1ca7b70d92c6

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

Filesize
1.6MB

MD5
d84fc8f135bbf515b8f99412b58fe5b1

SHA1
5707a9ab80925f288f0fcbf0b211d0f2801c595e

SHA256
95273409959433f7b80f387eec09692291e7795c30ed659c1b1228a5ad72a5cc

SHA512
8f2173c34e7db6700e8c4c4683789a5658a9d27ca3bb921872454d75b6c360f89b5b593d4d258d97fd1b7fc00c99587ebf67235b32e30a58010d1ca7b70d92c6

Download Submit
memory/4548-140-0x000000003F700000-0x000000003FB39000-memory.dmp

Filesize
4.2MB

Download
memory/4548-144-0x000000003F700000-0x000000003FB39000-memory.dmp

Filesize
4.2MB

Download
memory/4548-143-0x000000003F700000-0x000000003FB39000-memory.dmp

Filesize
4.2MB

Download
memory/4548-142-0x000000003F700000-0x000000003FB39000-memory.dmp

Filesize
4.2MB

Download
memory/4548-141-0x0000000077D30000-0x0000000077ED3000-memory.dmp

Filesize
1.6MB

Download
memory/4776-134-0x000000003FF70000-0x00000000403A9000-memory.dmp

Filesize
4.2MB

Download
memory/4776-139-0x0000000077D30000-0x0000000077ED3000-memory.dmp

Filesize
1.6MB

Download
memory/4776-138-0x000000003FF70000-0x00000000403A9000-memory.dmp

Filesize
4.2MB

Download
memory/4776-130-0x000000003FF70000-0x00000000403A9000-memory.dmp

Filesize
4.2MB

Download
memory/4776-133-0x000000003FF70000-0x00000000403A9000-memory.dmp

Filesize
4.2MB

Download
memory/4776-132-0x000000003FF70000-0x00000000403A9000-memory.dmp

Filesize
4.2MB

Download
memory/4776-131-0x0000000077D30000-0x0000000077ED3000-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