buer | ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e

Analysis

max time kernel
106s
max time network
118s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
25/06/2022, 02:23

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General

Target
ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e.exe
Size 1.6MB
Sample220625-ct6tpscge5
SHA256 ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e
MD5 4f6928ac042fe087533e8d7f4fbc4b74
SHA1 59cb8e3ed172b41351ae9a8a6e15cd7efdc0250c
SHA512 efcf031b00d16a2fd406cbdc35ca8a1bcc6679fcd72c169e56c6231074fb7e74fe21ffb586970c48ad57090412c24caa15890f7bad44654c7f2deb39772401a9
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-1-5-21-1809750270-3141839489-3074374771-1000\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/4528-134-0x000000003FCA0000-0x00000000400E1000-memory.dmp	buer
behavioral2/memory/4496-139-0x000000003FF70000-0x00000000403B1000-memory.dmp	buer
behavioral2/memory/4496-140-0x000000003FF70000-0x00000000403B1000-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__	ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	plugin.exe

Executes dropped EXE 1 IoCs

pid	Process
4496	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	ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e.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-1-5-21-1809750270-3141839489-3074374771-1000\Software\Wine	ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e.exe
Key opened	\REGISTRY\USER\S-1-5-21-1809750270-3141839489-3074374771-1000\Software\Wine	plugin.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4528	ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e.exe
4496	plugin.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
1192	4496	WerFault.exe	83
4704	684	WerFault.exe	84

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4528	ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e.exe
4528	ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e.exe
4496	plugin.exe
4496	plugin.exe
4496	plugin.exe
4496	plugin.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4528 wrote to memory of 4496	4528	ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e.exe	83
PID 4528 wrote to memory of 4496	4528	ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e.exe	83
PID 4528 wrote to memory of 4496	4528	ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e.exe	83
PID 4496 wrote to memory of 684	4496	plugin.exe	84
PID 4496 wrote to memory of 684	4496	plugin.exe	84
PID 4496 wrote to memory of 684	4496	plugin.exe	84
PID 4496 wrote to memory of 684	4496	plugin.exe	84
PID 4496 wrote to memory of 684	4496	plugin.exe	84
PID 4496 wrote to memory of 684	4496	plugin.exe	84
PID 4496 wrote to memory of 684	4496	plugin.exe	84
PID 4496 wrote to memory of 684	4496	plugin.exe	84
PID 4496 wrote to memory of 684	4496	plugin.exe	84
PID 4496 wrote to memory of 684	4496	plugin.exe	84
PID 4496 wrote to memory of 684	4496	plugin.exe	84
PID 4496 wrote to memory of 684	4496	plugin.exe	84

C:\Users\Admin\AppData\Local\Temp\ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e.exe
"C:\Users\Admin\AppData\Local\Temp\ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e.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:4528
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e.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:4496
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:684
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 684 -s 220
      4⤵
      Program crash
      PID:4704
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4496 -s 756
    3⤵
    - Program crash
    PID:1192

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 684 -ip 684
1⤵
PID:216

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4496 -ip 4496
1⤵
PID:1804

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

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Downloads

plugin.exe

Path C:\ProgramData\UBlockPlugin\plugin.exe
Size 1.6MB
SHA256 ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e
MD5 4f6928ac042fe087533e8d7f4fbc4b74
SHA1 59cb8e3ed172b41351ae9a8a6e15cd7efdc0250c
SHA512 efcf031b00d16a2fd406cbdc35ca8a1bcc6679fcd72c169e56c6231074fb7e74fe21ffb586970c48ad57090412c24caa15890f7bad44654c7f2deb39772401a9
SSDEEP 49152:LbwBhGDF0hFkGTjE5aO4jxwk2mBXhWaMEC5jHxF:gaD+heG3MN5xNEC5P
MD5 SHA1 SHA512 SSDEEP

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plugin.exe

Path C:\ProgramData\UBlockPlugin\plugin.exe
Size 1.6MB
SHA256 ec5dde3e68cf7ed672be82433da49a7c44bb2c109956b2b29161e0b3f34b025e
MD5 4f6928ac042fe087533e8d7f4fbc4b74
SHA1 59cb8e3ed172b41351ae9a8a6e15cd7efdc0250c
SHA512 efcf031b00d16a2fd406cbdc35ca8a1bcc6679fcd72c169e56c6231074fb7e74fe21ffb586970c48ad57090412c24caa15890f7bad44654c7f2deb39772401a9
SSDEEP 49152:LbwBhGDF0hFkGTjE5aO4jxwk2mBXhWaMEC5jHxF:gaD+heG3MN5xNEC5P
MD5 SHA1 SHA512 SSDEEP

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memory/4496-136-0x000000003FF70000-0x00000000403B1000-memory.dmp

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memory/4496-138-0x00000000777E0000-0x0000000077983000-memory.dmp

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memory/4496-139-0x000000003FF70000-0x00000000403B1000-memory.dmp

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memory/4496-140-0x000000003FF70000-0x00000000403B1000-memory.dmp

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memory/4496-141-0x00000000777E0000-0x0000000077983000-memory.dmp

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memory/4528-130-0x000000003FCA0000-0x00000000400E1000-memory.dmp

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memory/4528-134-0x000000003FCA0000-0x00000000400E1000-memory.dmp

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memory/4528-135-0x00000000777E0000-0x0000000077983000-memory.dmp

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