buer | 3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203

General

Target

3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exe
Size

1.8MB
MD5

28623b3264e04f4b160425d0c10f4a54
SHA1

d8d8b1f79204ec37e62a8cda2778808c91de8d98
SHA256

3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203
SHA512

0047420a38ab935eae6781e1e07d6f558841cb940cd1b337d30da20b9b1b620ef54218d564d2eb23de6d6b37b5ba4db8d63cacf5b52916cf96867da9da8a3d82

Score

10^/10

buer evasion loader persistence

Malware Config

Extracted

Family

buer

C2

http://loy01.top/

http://loy02.top/

cook5**gjt+,)ojk*

cook5**gjt+-)ojk*

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

Processes:

plugin.exe

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

Processes:

resource	yara_rule
behavioral2/memory/2852-135-0x000000003F9F0000-0x000000003FE77000-memory.dmp	buer
behavioral2/memory/3184-138-0x000000003FBD0000-0x0000000040057000-memory.dmp	buer
behavioral2/memory/3184-141-0x000000003FBD0000-0x0000000040057000-memory.dmp	buer

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 2 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

Processes:

3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exeplugin.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	plugin.exe

Executes dropped EXE 1 IoCs

Processes:

plugin.exe

pid	Process
3184	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

Processes:

plugin.exe3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exe

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	plugin.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	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

Processes:

3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exeplugin.exe

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Software\Wine	3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exe
Key opened	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Software\Wine	plugin.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exeplugin.exe

pid	Process
2852	3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exe
3184	plugin.exe

Program crash 1 IoCs

Processes:

WerFault.exe

pid	pid_target	Process	procid_target
4184	4840	WerFault.exe	82

Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exeplugin.exe

pid	Process
2852	3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exe
2852	3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exe
3184	plugin.exe
3184	plugin.exe
3184	plugin.exe
3184	plugin.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exeplugin.exe

description	pid	Process	procid_target
PID 2852 wrote to memory of 3184	2852	3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exe	81
PID 2852 wrote to memory of 3184	2852	3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exe	81
PID 2852 wrote to memory of 3184	2852	3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exe	81
PID 3184 wrote to memory of 4840	3184	plugin.exe	82
PID 3184 wrote to memory of 4840	3184	plugin.exe	82
PID 3184 wrote to memory of 4840	3184	plugin.exe	82
PID 3184 wrote to memory of 4840	3184	plugin.exe	82
PID 3184 wrote to memory of 4840	3184	plugin.exe	82
PID 3184 wrote to memory of 4840	3184	plugin.exe	82
PID 3184 wrote to memory of 4840	3184	plugin.exe	82
PID 3184 wrote to memory of 4840	3184	plugin.exe	82
PID 3184 wrote to memory of 4840	3184	plugin.exe	82
PID 3184 wrote to memory of 4840	3184	plugin.exe	82
PID 3184 wrote to memory of 4840	3184	plugin.exe	82
PID 3184 wrote to memory of 4840	3184	plugin.exe	82

C:\Users\Admin\AppData\Local\Temp\3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.exe
"C:\Users\Admin\AppData\Local\Temp\3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.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:2852
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203.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:3184
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:4840
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4840 -s 224
      4⤵
      Program crash
      PID:4184

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 4840 -ip 4840
1⤵
PID:544

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
28623b3264e04f4b160425d0c10f4a54

SHA1
d8d8b1f79204ec37e62a8cda2778808c91de8d98

SHA256
3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203

SHA512
0047420a38ab935eae6781e1e07d6f558841cb940cd1b337d30da20b9b1b620ef54218d564d2eb23de6d6b37b5ba4db8d63cacf5b52916cf96867da9da8a3d82

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

Filesize
1.8MB

MD5
28623b3264e04f4b160425d0c10f4a54

SHA1
d8d8b1f79204ec37e62a8cda2778808c91de8d98

SHA256
3c1a487926e726fda53c8d5e2a6f455fb6a7a5de3758925d9250c95c17b19203

SHA512
0047420a38ab935eae6781e1e07d6f558841cb940cd1b337d30da20b9b1b620ef54218d564d2eb23de6d6b37b5ba4db8d63cacf5b52916cf96867da9da8a3d82

Download Submit
memory/2852-130-0x000000003F9F0000-0x000000003FE77000-memory.dmp

Filesize
4.5MB

Download
memory/2852-135-0x000000003F9F0000-0x000000003FE77000-memory.dmp

Filesize
4.5MB

Download
memory/2852-136-0x00000000771A0000-0x0000000077343000-memory.dmp

Filesize
1.6MB

Download
memory/2852-134-0x00000000771A0000-0x0000000077343000-memory.dmp

Filesize
1.6MB

Download
memory/3184-131-0x0000000000000000-mapping.dmp

Download
memory/3184-137-0x00000000771A0000-0x0000000077343000-memory.dmp

Filesize
1.6MB

Download
memory/3184-138-0x000000003FBD0000-0x0000000040057000-memory.dmp

Filesize
4.5MB

Download
memory/3184-140-0x00000000771A0000-0x0000000077343000-memory.dmp

Filesize
1.6MB

Download
memory/3184-141-0x000000003FBD0000-0x0000000040057000-memory.dmp

Filesize
4.5MB

Download
memory/4840-139-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads