buer | 796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6

General

Target

796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6.exe
Size

1.7MB
MD5

d88f42698d2195f61bedb72ce885a758
SHA1

a7854723c51857ab0e958108be18331aa3ff8fe6
SHA256

796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6
SHA512

6be3825bed91188e6729f70fec9ac182ca9ecbdcfef970643665a1ebba9c160cfb68ae3685ce38f455b729c63c8cd2da56bf32881fe0181a4729bfbedc22d752

Score

10^/10

buer evasion loader persistence

Malware Config

Extracted

Family

buer

C2

http://lodddd01.info/

http://lodddd02.info/

cook5**gj____+,)diaj*

cook5**gj____+-)diaj*

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-1-5-21-2632097139-1792035885-811742494-1000\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/3900-134-0x000000003F210000-0x000000003F65E000-memory.dmp	buer
behavioral2/memory/3424-139-0x000000003F580000-0x000000003F9CE000-memory.dmp	buer
behavioral2/memory/3424-140-0x000000003F580000-0x000000003F9CE000-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__	796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	plugin.exe

Executes dropped EXE 1 IoCs

pid	Process
3424	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	796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6.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-1-5-21-2632097139-1792035885-811742494-1000\Software\Wine	796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6.exe
Key opened	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Software\Wine	plugin.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3900	796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6.exe
3424	plugin.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
3916	4632	WerFault.exe	79
4240	3424	WerFault.exe	78

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3900	796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6.exe
3900	796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6.exe
3424	plugin.exe
3424	plugin.exe
3424	plugin.exe
3424	plugin.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3900 wrote to memory of 3424	3900	796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6.exe	78
PID 3900 wrote to memory of 3424	3900	796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6.exe	78
PID 3900 wrote to memory of 3424	3900	796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6.exe	78
PID 3424 wrote to memory of 4632	3424	plugin.exe	79
PID 3424 wrote to memory of 4632	3424	plugin.exe	79
PID 3424 wrote to memory of 4632	3424	plugin.exe	79
PID 3424 wrote to memory of 4632	3424	plugin.exe	79
PID 3424 wrote to memory of 4632	3424	plugin.exe	79
PID 3424 wrote to memory of 4632	3424	plugin.exe	79
PID 3424 wrote to memory of 4632	3424	plugin.exe	79
PID 3424 wrote to memory of 4632	3424	plugin.exe	79
PID 3424 wrote to memory of 4632	3424	plugin.exe	79
PID 3424 wrote to memory of 4632	3424	plugin.exe	79
PID 3424 wrote to memory of 4632	3424	plugin.exe	79
PID 3424 wrote to memory of 4632	3424	plugin.exe	79

C:\Users\Admin\AppData\Local\Temp\796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6.exe
"C:\Users\Admin\AppData\Local\Temp\796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6.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:3900
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6.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:3424
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:4632
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4632 -s 220
      4⤵
      Program crash
      PID:3916
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3424 -s 1128
    3⤵
    - Program crash
    PID:4240

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4632 -ip 4632
1⤵
PID:3848

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 3424 -ip 3424
1⤵
PID:3320

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
d88f42698d2195f61bedb72ce885a758

SHA1
a7854723c51857ab0e958108be18331aa3ff8fe6

SHA256
796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6

SHA512
6be3825bed91188e6729f70fec9ac182ca9ecbdcfef970643665a1ebba9c160cfb68ae3685ce38f455b729c63c8cd2da56bf32881fe0181a4729bfbedc22d752

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

Filesize
1.7MB

MD5
d88f42698d2195f61bedb72ce885a758

SHA1
a7854723c51857ab0e958108be18331aa3ff8fe6

SHA256
796e1936b00307eb5d0b6af571ca8dfda475be4a4dfaacac4aa72bc1c5741aa6

SHA512
6be3825bed91188e6729f70fec9ac182ca9ecbdcfef970643665a1ebba9c160cfb68ae3685ce38f455b729c63c8cd2da56bf32881fe0181a4729bfbedc22d752

Download Submit
memory/3424-136-0x000000003F580000-0x000000003F9CE000-memory.dmp

Filesize
4.3MB

Download
memory/3424-138-0x0000000077B50000-0x0000000077CF3000-memory.dmp

Filesize
1.6MB

Download
memory/3424-139-0x000000003F580000-0x000000003F9CE000-memory.dmp

Filesize
4.3MB

Download
memory/3424-140-0x000000003F580000-0x000000003F9CE000-memory.dmp

Filesize
4.3MB

Download
memory/3424-141-0x0000000077B50000-0x0000000077CF3000-memory.dmp

Filesize
1.6MB

Download
memory/3900-130-0x000000003F210000-0x000000003F65E000-memory.dmp

Filesize
4.3MB

Download
memory/3900-134-0x000000003F210000-0x000000003F65E000-memory.dmp

Filesize
4.3MB

Download
memory/3900-135-0x0000000077B50000-0x0000000077CF3000-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