buer | a1bdc2ca2e359ac7d5c26afb3cd89bb39285b8a8acc5876e691ceb4ba807b704

General

Target

Electronic_Tracking_INV_#9836582365728523752.exe
Size

245KB
MD5

64f86981c7450dfd2c3915f213fc6720
SHA1

5410d0e8569f0936b32de3199e8a187d6227fc1f
SHA256

a1bdc2ca2e359ac7d5c26afb3cd89bb39285b8a8acc5876e691ceb4ba807b704
SHA512

02e9e2e41a96a4e0279de44c5cdd7c18a4d08966e0e2ba9979d929f0fa5a902db1ceb3f2eb8a73d97725eed917f9e57d11999a0218f3f286908bf7e731931b22

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://specialhosting.ga/

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\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\7d88e65552dcd26d37bf\\gennt.exe\""	gennt.exe

Buer Loader 6 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral2/memory/3908-0-0x0000000000F70000-0x0000000000F7F000-memory.dmp	buer
behavioral2/memory/3704-1-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral2/memory/3704-2-0x000000004000303B-mapping.dmp	buer
behavioral2/memory/3704-4-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral2/memory/2420-8-0x00000000005D0000-0x00000000005DF000-memory.dmp	buer
behavioral2/memory/2856-10-0x000000004000303B-mapping.dmp	buer

Executes dropped EXE 2 IoCs

pid	Process
2420	gennt.exe
2856	gennt.exe

Deletes itself 1 IoCs

pid	Process
2856	gennt.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3908 set thread context of 3704	3908	Electronic_Tracking_INV_#9836582365728523752.exe	66
PID 2420 set thread context of 2856	2420	gennt.exe	74

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3820	2568	WerFault.exe	75

Suspicious behavior: EnumeratesProcesses 13 IoCs

pid	Process
3820	WerFault.exe
3820	WerFault.exe
3820	WerFault.exe
3820	WerFault.exe
3820	WerFault.exe
3820	WerFault.exe
3820	WerFault.exe
3820	WerFault.exe
3820	WerFault.exe
3820	WerFault.exe
3820	WerFault.exe
3820	WerFault.exe
3820	WerFault.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
3908	Electronic_Tracking_INV_#9836582365728523752.exe
2420	gennt.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeRestorePrivilege	3820	WerFault.exe
Token: SeBackupPrivilege	3820	WerFault.exe
Token: SeDebugPrivilege	3820	WerFault.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 3908 wrote to memory of 3704	3908	Electronic_Tracking_INV_#9836582365728523752.exe	66
PID 3908 wrote to memory of 3704	3908	Electronic_Tracking_INV_#9836582365728523752.exe	66
PID 3908 wrote to memory of 3704	3908	Electronic_Tracking_INV_#9836582365728523752.exe	66
PID 3908 wrote to memory of 3704	3908	Electronic_Tracking_INV_#9836582365728523752.exe	66
PID 3704 wrote to memory of 2420	3704	electronic_tracking_inv_#9836582365728523752.exe	73
PID 3704 wrote to memory of 2420	3704	electronic_tracking_inv_#9836582365728523752.exe	73
PID 3704 wrote to memory of 2420	3704	electronic_tracking_inv_#9836582365728523752.exe	73
PID 2420 wrote to memory of 2856	2420	gennt.exe	74
PID 2420 wrote to memory of 2856	2420	gennt.exe	74
PID 2420 wrote to memory of 2856	2420	gennt.exe	74
PID 2420 wrote to memory of 2856	2420	gennt.exe	74
PID 2856 wrote to memory of 2568	2856	gennt.exe	75
PID 2856 wrote to memory of 2568	2856	gennt.exe	75
PID 2856 wrote to memory of 2568	2856	gennt.exe	75
PID 2856 wrote to memory of 2568	2856	gennt.exe	75
PID 2856 wrote to memory of 2568	2856	gennt.exe	75
PID 2856 wrote to memory of 2568	2856	gennt.exe	75
PID 2856 wrote to memory of 2568	2856	gennt.exe	75
PID 2856 wrote to memory of 2568	2856	gennt.exe	75
PID 2856 wrote to memory of 2568	2856	gennt.exe	75
PID 2856 wrote to memory of 2568	2856	gennt.exe	75
PID 2856 wrote to memory of 2568	2856	gennt.exe	75

C:\Users\Admin\AppData\Local\Temp\Electronic_Tracking_INV_#9836582365728523752.exe
"C:\Users\Admin\AppData\Local\Temp\Electronic_Tracking_INV_#9836582365728523752.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3908
- C:\Users\Admin\AppData\Local\Temp\electronic_tracking_inv_#9836582365728523752.exe
  "C:\Users\Admin\AppData\Local\Temp\Electronic_Tracking_INV_#9836582365728523752.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3704
- - C:\ProgramData\7d88e65552dcd26d37bf\gennt.exe
    C:\ProgramData\7d88e65552dcd26d37bf\gennt.exe "C:\Users\Admin\AppData\Local\Temp\electronic_tracking_inv_#9836582365728523752.exe" ensgJJ
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of WriteProcessMemory
    PID:2420
  - - C:\ProgramData\7d88e65552dcd26d37bf\gennt.exe
      C:\ProgramData\7d88e65552dcd26d37bf\gennt.exe "C:\Users\Admin\AppData\Local\Temp\electronic_tracking_inv_#9836582365728523752.exe" ensgJJ
      4⤵
      Modifies WinLogon for persistence
      Executes dropped EXE
      Deletes itself
      Suspicious use of WriteProcessMemory
      PID:2856
    - - C:\Windows\SysWOW64\secinit.exe
        
        C:\ProgramData\7d88e65552dcd26d37bf\gennt.exe
        5⤵
        
        PID:2568
      - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 2568 -s 332
        6⤵
        Program crash
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3820

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2420-8-0x00000000005D0000-0x00000000005DF000-memory.dmp

Filesize
60KB

Download
memory/3704-4-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/3704-1-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/3820-15-0x0000000004790000-0x0000000004791000-memory.dmp

Filesize
4KB

Download
memory/3820-21-0x0000000004F60000-0x0000000004F61000-memory.dmp

Filesize
4KB

Download
memory/3908-0-0x0000000000F70000-0x0000000000F7F000-memory.dmp

Filesize
60KB

Download

Analysis

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