buer | 144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6

General

Target

144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6.exe
Size

1.8MB
MD5

cbac76c9c5eaac7aff3356d11473d5c8
SHA1

b297106cab96d0a91b06137a5d4c3a3ba7d0bcd6
SHA256

144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6
SHA512

fd114f7c3d7b1544c9f941c3864d6e91e7d6401c763f55b7d0b434e09458f8e14259ffe7b5a1d56b3375d3ab3fc2c066fb1d904bbc01fb8030790654e92a7871

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

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/2728-135-0x000000003F6C0000-0x000000003FB3C000-memory.dmp	buer
behavioral2/memory/2024-140-0x000000003FB50000-0x000000003FFCC000-memory.dmp	buer
behavioral2/memory/2024-144-0x000000003FB50000-0x000000003FFCC000-memory.dmp	buer
behavioral2/memory/2024-145-0x000000003FB50000-0x000000003FFCC000-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__	144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	plugin.exe

Executes dropped EXE 1 IoCs

pid	Process
2024	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	144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6.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	144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6.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
2728	144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6.exe
2024	plugin.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3532	2336	WerFault.exe	79

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2728	144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6.exe
2728	144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6.exe
2024	plugin.exe
2024	plugin.exe
2024	plugin.exe
2024	plugin.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2728 wrote to memory of 2024	2728	144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6.exe	78
PID 2728 wrote to memory of 2024	2728	144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6.exe	78
PID 2728 wrote to memory of 2024	2728	144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6.exe	78
PID 2024 wrote to memory of 2336	2024	plugin.exe	79
PID 2024 wrote to memory of 2336	2024	plugin.exe	79
PID 2024 wrote to memory of 2336	2024	plugin.exe	79
PID 2024 wrote to memory of 2336	2024	plugin.exe	79
PID 2024 wrote to memory of 2336	2024	plugin.exe	79
PID 2024 wrote to memory of 2336	2024	plugin.exe	79
PID 2024 wrote to memory of 2336	2024	plugin.exe	79
PID 2024 wrote to memory of 2336	2024	plugin.exe	79
PID 2024 wrote to memory of 2336	2024	plugin.exe	79
PID 2024 wrote to memory of 2336	2024	plugin.exe	79
PID 2024 wrote to memory of 2336	2024	plugin.exe	79
PID 2024 wrote to memory of 2336	2024	plugin.exe	79

C:\Users\Admin\AppData\Local\Temp\144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6.exe
"C:\Users\Admin\AppData\Local\Temp\144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6.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:2728
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6.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:2024
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:2336
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2336 -s 224
      4⤵
      Program crash
      PID:3532

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 180 -p 2336 -ip 2336
1⤵
PID:1564

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
1.8MB

MD5
cbac76c9c5eaac7aff3356d11473d5c8

SHA1
b297106cab96d0a91b06137a5d4c3a3ba7d0bcd6

SHA256
144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6

SHA512
fd114f7c3d7b1544c9f941c3864d6e91e7d6401c763f55b7d0b434e09458f8e14259ffe7b5a1d56b3375d3ab3fc2c066fb1d904bbc01fb8030790654e92a7871

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

Filesize
1.8MB

MD5
cbac76c9c5eaac7aff3356d11473d5c8

SHA1
b297106cab96d0a91b06137a5d4c3a3ba7d0bcd6

SHA256
144af4b3b008e90a5b4bdfb4f815d95d2fb6a4f01b380964d7f7e744fa9935a6

SHA512
fd114f7c3d7b1544c9f941c3864d6e91e7d6401c763f55b7d0b434e09458f8e14259ffe7b5a1d56b3375d3ab3fc2c066fb1d904bbc01fb8030790654e92a7871

Download Submit
memory/2024-139-0x000000003FB50000-0x000000003FFCC000-memory.dmp

Filesize
4.5MB

Download
memory/2024-140-0x000000003FB50000-0x000000003FFCC000-memory.dmp

Filesize
4.5MB

Download
memory/2024-141-0x0000000077490000-0x0000000077633000-memory.dmp

Filesize
1.6MB

Download
memory/2024-144-0x000000003FB50000-0x000000003FFCC000-memory.dmp

Filesize
4.5MB

Download
memory/2024-145-0x000000003FB50000-0x000000003FFCC000-memory.dmp

Filesize
4.5MB

Download
memory/2024-146-0x0000000077490000-0x0000000077633000-memory.dmp

Filesize
1.6MB

Download
memory/2728-135-0x000000003F6C0000-0x000000003FB3C000-memory.dmp

Filesize
4.5MB

Download
memory/2728-134-0x0000000077490000-0x0000000077633000-memory.dmp

Filesize
1.6MB

Download
memory/2728-133-0x000000003F6C0000-0x000000003FB3C000-memory.dmp

Filesize
4.5MB

Download
memory/2728-142-0x0000000077490000-0x0000000077633000-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