buer | ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b

General

Target

ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b.exe
Size

1.5MB
MD5

6943e6fa21cf64f70bccdf137160b9ca
SHA1

e0d5fe545d1d17dd1e06f21b6767fb2a20df2e86
SHA256

ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b
SHA512

6e83cb6001bcca7f7376f80e215671a0210e8fc5670a28d7b8373b02d831d3c7b4adaab85b5596d5d7ebe89fce2f75975d6e9a5446f0cf05d0c6d2c50b50d99a

Score

10^/10

buer evasion loader

Malware Config

Extracted

Family

buer

C2

https://loddd01.info/

https://loddd02.info/

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Buer Loader 7 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/2972-132-0x000000003FDC0000-0x00000000401A6000-memory.dmp	buer
behavioral2/memory/2972-133-0x000000003FDC0000-0x00000000401A6000-memory.dmp	buer
behavioral2/memory/2972-134-0x000000003FDC0000-0x00000000401A6000-memory.dmp	buer
behavioral2/memory/2972-139-0x000000003FDC0000-0x00000000401A6000-memory.dmp	buer
behavioral2/memory/4528-142-0x000000003FCB0000-0x0000000040096000-memory.dmp	buer
behavioral2/memory/4528-143-0x000000003FCB0000-0x0000000040096000-memory.dmp	buer
behavioral2/memory/4528-144-0x000000003FCB0000-0x0000000040096000-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__	ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	plugin.exe

Executes dropped EXE 1 IoCs

pid	Process
4528	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	ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b.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	plugin.exe
Key opened	\REGISTRY\USER\S-1-5-21-1101907861-274115917-2188613224-1000\Software\Wine	ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2972	ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b.exe
4528	plugin.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3892	3968	WerFault.exe	83

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2972	ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b.exe
2972	ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b.exe
4528	plugin.exe
4528	plugin.exe
4528	plugin.exe
4528	plugin.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 2972 wrote to memory of 4528	2972	ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b.exe	82
PID 2972 wrote to memory of 4528	2972	ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b.exe	82
PID 2972 wrote to memory of 4528	2972	ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b.exe	82
PID 4528 wrote to memory of 3968	4528	plugin.exe	83
PID 4528 wrote to memory of 3968	4528	plugin.exe	83
PID 4528 wrote to memory of 3968	4528	plugin.exe	83
PID 4528 wrote to memory of 3968	4528	plugin.exe	83
PID 4528 wrote to memory of 3968	4528	plugin.exe	83
PID 4528 wrote to memory of 3968	4528	plugin.exe	83
PID 4528 wrote to memory of 3968	4528	plugin.exe	83
PID 4528 wrote to memory of 3968	4528	plugin.exe	83
PID 4528 wrote to memory of 3968	4528	plugin.exe	83
PID 4528 wrote to memory of 3968	4528	plugin.exe	83
PID 4528 wrote to memory of 3968	4528	plugin.exe	83

C:\Users\Admin\AppData\Local\Temp\ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b.exe
"C:\Users\Admin\AppData\Local\Temp\ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b.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:2972
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b.exe" ensgJJ
  2⤵
  - 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:4528
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:3968
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3968 -s 176
      4⤵
      Program crash
      PID:3892

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 3968 -ip 3968
1⤵
PID:3248

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

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
1.5MB

MD5
6943e6fa21cf64f70bccdf137160b9ca

SHA1
e0d5fe545d1d17dd1e06f21b6767fb2a20df2e86

SHA256
ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b

SHA512
6e83cb6001bcca7f7376f80e215671a0210e8fc5670a28d7b8373b02d831d3c7b4adaab85b5596d5d7ebe89fce2f75975d6e9a5446f0cf05d0c6d2c50b50d99a

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

Filesize
1.5MB

MD5
6943e6fa21cf64f70bccdf137160b9ca

SHA1
e0d5fe545d1d17dd1e06f21b6767fb2a20df2e86

SHA256
ca8f4594a6800a308c5cbc8c6325e958e42dd4cf539ad4e01362dcc1ec20142b

SHA512
6e83cb6001bcca7f7376f80e215671a0210e8fc5670a28d7b8373b02d831d3c7b4adaab85b5596d5d7ebe89fce2f75975d6e9a5446f0cf05d0c6d2c50b50d99a

Download Submit
memory/2972-139-0x000000003FDC0000-0x00000000401A6000-memory.dmp

Filesize
3.9MB

Download
memory/2972-140-0x0000000077A80000-0x0000000077C23000-memory.dmp

Filesize
1.6MB

Download
memory/2972-134-0x000000003FDC0000-0x00000000401A6000-memory.dmp

Filesize
3.9MB

Download
memory/2972-132-0x000000003FDC0000-0x00000000401A6000-memory.dmp

Filesize
3.9MB

Download
memory/2972-131-0x0000000077A80000-0x0000000077C23000-memory.dmp

Filesize
1.6MB

Download
memory/2972-130-0x000000003FDC0000-0x00000000401A6000-memory.dmp

Filesize
3.9MB

Download
memory/2972-133-0x000000003FDC0000-0x00000000401A6000-memory.dmp

Filesize
3.9MB

Download
memory/4528-138-0x000000003FCB0000-0x0000000040096000-memory.dmp

Filesize
3.9MB

Download
memory/4528-141-0x0000000077A80000-0x0000000077C23000-memory.dmp

Filesize
1.6MB

Download
memory/4528-142-0x000000003FCB0000-0x0000000040096000-memory.dmp

Filesize
3.9MB

Download
memory/4528-143-0x000000003FCB0000-0x0000000040096000-memory.dmp

Filesize
3.9MB

Download
memory/4528-144-0x000000003FCB0000-0x0000000040096000-memory.dmp

Filesize
3.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads