buer | 36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31

Analysis

max time kernel
147s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
26/06/2022, 00:54

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General

Target
36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31.exe
Size 1.6MB
Sample220626-a9dfzscha6
SHA256 36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31
MD5 50db2b8af977c38ad30d3d0fe8f8837c
SHA1 7b948d2f9781aab32b99c0f0bd5da39db05c67f1
SHA512 2459794649b75c2c518dd2a830f62ef2459d24b324c9e0437988c7ab6ca19fa7937da5c8a7fb48afd97920773dcf32ad329b691ce780d6d1c7144da8ff5a8340
MD5 SHA1 SHA512

Score

10^/10

buer evasion loader persistence

Malware Config

Extracted

Family

buer

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-1-5-21-3751123196-3323558407-1869646069-1000\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/4220-134-0x000000003F4A0000-0x000000003F8D0000-memory.dmp	buer
behavioral2/memory/4240-138-0x0000000040000000-0x0000000040430000-memory.dmp	buer
behavioral2/memory/4240-140-0x0000000040000000-0x0000000040430000-memory.dmp	buer
behavioral2/memory/4240-142-0x0000000040000000-0x0000000040430000-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__	36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	plugin.exe

Executes dropped EXE 1 IoCs

pid	Process
4240	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	36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	plugin.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	plugin.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31.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	36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31.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
4220	36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31.exe
4240	plugin.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
4856	4240	WerFault.exe	81
2296	4180	WerFault.exe	82

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4220	36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31.exe
4220	36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31.exe
4240	plugin.exe
4240	plugin.exe
4240	plugin.exe
4240	plugin.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4220 wrote to memory of 4240	4220	36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31.exe	81
PID 4220 wrote to memory of 4240	4220	36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31.exe	81
PID 4220 wrote to memory of 4240	4220	36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31.exe	81
PID 4240 wrote to memory of 4180	4240	plugin.exe	82
PID 4240 wrote to memory of 4180	4240	plugin.exe	82
PID 4240 wrote to memory of 4180	4240	plugin.exe	82
PID 4240 wrote to memory of 4180	4240	plugin.exe	82
PID 4240 wrote to memory of 4180	4240	plugin.exe	82
PID 4240 wrote to memory of 4180	4240	plugin.exe	82
PID 4240 wrote to memory of 4180	4240	plugin.exe	82
PID 4240 wrote to memory of 4180	4240	plugin.exe	82
PID 4240 wrote to memory of 4180	4240	plugin.exe	82
PID 4240 wrote to memory of 4180	4240	plugin.exe	82
PID 4240 wrote to memory of 4180	4240	plugin.exe	82
PID 4240 wrote to memory of 4180	4240	plugin.exe	82

C:\Users\Admin\AppData\Local\Temp\36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31.exe
"C:\Users\Admin\AppData\Local\Temp\36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31.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:4220
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31.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:4240
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:4180
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4180 -s 176
      4⤵
      Program crash
      PID:2296
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4240 -s 828
    3⤵
    - Program crash
    PID:4856

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 364 -p 4180 -ip 4180
1⤵
PID:2224

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 4240 -ip 4240
1⤵
PID:2952

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

plugin.exe

Path C:\ProgramData\UBlockPlugin\plugin.exe
Size 1.6MB
SHA256 36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31
MD5 50db2b8af977c38ad30d3d0fe8f8837c
SHA1 7b948d2f9781aab32b99c0f0bd5da39db05c67f1
SHA512 2459794649b75c2c518dd2a830f62ef2459d24b324c9e0437988c7ab6ca19fa7937da5c8a7fb48afd97920773dcf32ad329b691ce780d6d1c7144da8ff5a8340
SSDEEP 49152:QrIDwYtBwdDFE9Qf/2hzk7MMpVI9mUL+3:QrInw2iekAy8JM
MD5 SHA1 SHA512 SSDEEP

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plugin.exe

Path C:\ProgramData\UBlockPlugin\plugin.exe
Size 1.6MB
SHA256 36f546aa982aa0d2f26ebfbc3f468387b6c987ba045e9903b174ca052cb8dc31
MD5 50db2b8af977c38ad30d3d0fe8f8837c
SHA1 7b948d2f9781aab32b99c0f0bd5da39db05c67f1
SHA512 2459794649b75c2c518dd2a830f62ef2459d24b324c9e0437988c7ab6ca19fa7937da5c8a7fb48afd97920773dcf32ad329b691ce780d6d1c7144da8ff5a8340
SSDEEP 49152:QrIDwYtBwdDFE9Qf/2hzk7MMpVI9mUL+3:QrInw2iekAy8JM
MD5 SHA1 SHA512 SSDEEP

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memory/4220-134-0x000000003F4A0000-0x000000003F8D0000-memory.dmp

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memory/4220-135-0x0000000077060000-0x0000000077203000-memory.dmp

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memory/4220-130-0x000000003F4A0000-0x000000003F8D0000-memory.dmp

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memory/4240-136-0x0000000040000000-0x0000000040430000-memory.dmp

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memory/4240-137-0x0000000077060000-0x0000000077203000-memory.dmp

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memory/4240-138-0x0000000040000000-0x0000000040430000-memory.dmp

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memory/4240-140-0x0000000040000000-0x0000000040430000-memory.dmp

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memory/4240-141-0x0000000077060000-0x0000000077203000-memory.dmp

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memory/4240-142-0x0000000040000000-0x0000000040430000-memory.dmp

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memory/4240-143-0x0000000077060000-0x0000000077203000-memory.dmp

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