buer | 99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22

General

Target

99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22.exe
Size

1.6MB
MD5

5b89932d8f9f7806c66141203042ea1b
SHA1

dd38e9b111a3581217c8aa9ccc80d4d838a20ea7
SHA256

99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22
SHA512

69b5d0191a294fba020d4e354b37c13d4d39c65904013be636c7b9b02bec29a7f7027446d5f513db32a31c75f01955ba97e01927660d936e6878101a732797bc

Score

10^/10

buer evasion loader persistence

Malware Config

Extracted

Family

buer

C2

http://kload01.info/

http://kload02.info/

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 8 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/3196-130-0x000000003FA80000-0x000000003FEBB000-memory.dmp	buer
behavioral2/memory/3196-132-0x000000003FA80000-0x000000003FEBB000-memory.dmp	buer
behavioral2/memory/3196-133-0x000000003FA80000-0x000000003FEBB000-memory.dmp	buer
behavioral2/memory/3196-134-0x000000003FA80000-0x000000003FEBB000-memory.dmp	buer
behavioral2/memory/3196-139-0x000000003FA80000-0x000000003FEBB000-memory.dmp	buer
behavioral2/memory/4224-142-0x000000003F410000-0x000000003F84B000-memory.dmp	buer
behavioral2/memory/4224-143-0x000000003F410000-0x000000003F84B000-memory.dmp	buer
behavioral2/memory/4224-144-0x000000003F410000-0x000000003F84B000-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__	plugin.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22.exe

Executes dropped EXE 1 IoCs

pid	Process
4224	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	99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22.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	99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22.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
3196	99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22.exe
4224	plugin.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4000	1344	WerFault.exe	83

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3196	99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22.exe
3196	99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22.exe
4224	plugin.exe
4224	plugin.exe
4224	plugin.exe
4224	plugin.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3196 wrote to memory of 4224	3196	99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22.exe	82
PID 3196 wrote to memory of 4224	3196	99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22.exe	82
PID 3196 wrote to memory of 4224	3196	99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22.exe	82
PID 4224 wrote to memory of 1344	4224	plugin.exe	83
PID 4224 wrote to memory of 1344	4224	plugin.exe	83
PID 4224 wrote to memory of 1344	4224	plugin.exe	83
PID 4224 wrote to memory of 1344	4224	plugin.exe	83
PID 4224 wrote to memory of 1344	4224	plugin.exe	83
PID 4224 wrote to memory of 1344	4224	plugin.exe	83
PID 4224 wrote to memory of 1344	4224	plugin.exe	83
PID 4224 wrote to memory of 1344	4224	plugin.exe	83
PID 4224 wrote to memory of 1344	4224	plugin.exe	83
PID 4224 wrote to memory of 1344	4224	plugin.exe	83
PID 4224 wrote to memory of 1344	4224	plugin.exe	83
PID 4224 wrote to memory of 1344	4224	plugin.exe	83

C:\Users\Admin\AppData\Local\Temp\99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22.exe
"C:\Users\Admin\AppData\Local\Temp\99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22.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:3196
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22.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:4224
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:1344
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1344 -s 220
      4⤵
      Program crash
      PID:4000

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1344 -ip 1344
1⤵
PID:1200

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
1.6MB

MD5
5b89932d8f9f7806c66141203042ea1b

SHA1
dd38e9b111a3581217c8aa9ccc80d4d838a20ea7

SHA256
99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22

SHA512
69b5d0191a294fba020d4e354b37c13d4d39c65904013be636c7b9b02bec29a7f7027446d5f513db32a31c75f01955ba97e01927660d936e6878101a732797bc

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

Filesize
1.6MB

MD5
5b89932d8f9f7806c66141203042ea1b

SHA1
dd38e9b111a3581217c8aa9ccc80d4d838a20ea7

SHA256
99ecaff6fefedf3b7b7d6d0dba4d15c55ca1a7d57a19e04c38908f02a1f9ca22

SHA512
69b5d0191a294fba020d4e354b37c13d4d39c65904013be636c7b9b02bec29a7f7027446d5f513db32a31c75f01955ba97e01927660d936e6878101a732797bc

Download Submit
memory/3196-134-0x000000003FA80000-0x000000003FEBB000-memory.dmp

Filesize
4.2MB

Download
memory/3196-130-0x000000003FA80000-0x000000003FEBB000-memory.dmp

Filesize
4.2MB

Download
memory/3196-133-0x000000003FA80000-0x000000003FEBB000-memory.dmp

Filesize
4.2MB

Download
memory/3196-132-0x000000003FA80000-0x000000003FEBB000-memory.dmp

Filesize
4.2MB

Download
memory/3196-139-0x000000003FA80000-0x000000003FEBB000-memory.dmp

Filesize
4.2MB

Download
memory/3196-140-0x0000000077CA0000-0x0000000077E43000-memory.dmp

Filesize
1.6MB

Download
memory/3196-131-0x0000000077CA0000-0x0000000077E43000-memory.dmp

Filesize
1.6MB

Download
memory/4224-138-0x000000003F410000-0x000000003F84B000-memory.dmp

Filesize
4.2MB

Download
memory/4224-141-0x0000000077CA0000-0x0000000077E43000-memory.dmp

Filesize
1.6MB

Download
memory/4224-142-0x000000003F410000-0x000000003F84B000-memory.dmp

Filesize
4.2MB

Download
memory/4224-143-0x000000003F410000-0x000000003F84B000-memory.dmp

Filesize
4.2MB

Download
memory/4224-144-0x000000003F410000-0x000000003F84B000-memory.dmp

Filesize
4.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads