buer | 1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9

General

Target

1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe
Size

144KB
MD5

37d8bced898bf955130f39645eba3f0a
SHA1

c411ffa43ad7cf7bf321017e9a2d7d9bae1f0cf5
SHA256

1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9
SHA512

1ae8c515a0a820552c8861fdde197dee0ea0f7fabae74ee4fac9c345f0e1dadf5448b0787cbedfa9e960980419dd3f59fbb8cae8da84df74283348ac80554eaa

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://rawcookies.ru/

https://westkingz.ru/

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\\cfb2287ad52cb75b3e24\\gennt.exe\""	gennt.exe

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/4992-135-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral2/memory/4992-137-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral2/memory/4992-138-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral2/memory/2636-147-0x0000000040000000-0x000000004000C000-memory.dmp	buer

Executes dropped EXE 2 IoCs

pid	Process
2384	gennt.exe
2636	gennt.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4260 set thread context of 4992	4260	1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe	89
PID 2384 set thread context of 2636	2384	gennt.exe	91

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 4260 wrote to memory of 4992	4260	1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe	89
PID 4260 wrote to memory of 4992	4260	1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe	89
PID 4260 wrote to memory of 4992	4260	1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe	89
PID 4260 wrote to memory of 4992	4260	1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe	89
PID 4260 wrote to memory of 4992	4260	1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe	89
PID 4260 wrote to memory of 4992	4260	1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe	89
PID 4260 wrote to memory of 4992	4260	1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe	89
PID 4260 wrote to memory of 4992	4260	1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe	89
PID 4260 wrote to memory of 4992	4260	1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe	89
PID 4992 wrote to memory of 2384	4992	1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe	90
PID 4992 wrote to memory of 2384	4992	1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe	90
PID 4992 wrote to memory of 2384	4992	1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe	90
PID 2384 wrote to memory of 2636	2384	gennt.exe	91
PID 2384 wrote to memory of 2636	2384	gennt.exe	91
PID 2384 wrote to memory of 2636	2384	gennt.exe	91
PID 2384 wrote to memory of 2636	2384	gennt.exe	91
PID 2384 wrote to memory of 2636	2384	gennt.exe	91
PID 2384 wrote to memory of 2636	2384	gennt.exe	91
PID 2384 wrote to memory of 2636	2384	gennt.exe	91
PID 2384 wrote to memory of 2636	2384	gennt.exe	91
PID 2384 wrote to memory of 2636	2384	gennt.exe	91
PID 2636 wrote to memory of 1380	2636	gennt.exe	92
PID 2636 wrote to memory of 1380	2636	gennt.exe	92
PID 2636 wrote to memory of 1380	2636	gennt.exe	92

C:\Users\Admin\AppData\Local\Temp\1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe
"C:\Users\Admin\AppData\Local\Temp\1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4260
- C:\Users\Admin\AppData\Local\Temp\1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe
  "{path}"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4992
- - C:\ProgramData\cfb2287ad52cb75b3e24\gennt.exe
    C:\ProgramData\cfb2287ad52cb75b3e24\gennt.exe "C:\Users\Admin\AppData\Local\Temp\1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe" ensgJJ
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:2384
  - - C:\ProgramData\cfb2287ad52cb75b3e24\gennt.exe
      "{path}"
      4⤵
      Modifies WinLogon for persistence
      Executes dropped EXE
      Suspicious use of WriteProcessMemory
      PID:2636
    - - C:\Windows\SysWOW64\secinit.exe
        
        C:\ProgramData\cfb2287ad52cb75b3e24\gennt.exe
        5⤵
        
        PID:1380

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

C:\ProgramData\cfb2287ad52cb75b3e24\gennt.exe

Filesize
144KB

MD5
37d8bced898bf955130f39645eba3f0a

SHA1
c411ffa43ad7cf7bf321017e9a2d7d9bae1f0cf5

SHA256
1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9

SHA512
1ae8c515a0a820552c8861fdde197dee0ea0f7fabae74ee4fac9c345f0e1dadf5448b0787cbedfa9e960980419dd3f59fbb8cae8da84df74283348ac80554eaa

Download Submit
C:\ProgramData\cfb2287ad52cb75b3e24\gennt.exe

Filesize
144KB

MD5
37d8bced898bf955130f39645eba3f0a

SHA1
c411ffa43ad7cf7bf321017e9a2d7d9bae1f0cf5

SHA256
1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9

SHA512
1ae8c515a0a820552c8861fdde197dee0ea0f7fabae74ee4fac9c345f0e1dadf5448b0787cbedfa9e960980419dd3f59fbb8cae8da84df74283348ac80554eaa

Download Submit
C:\ProgramData\cfb2287ad52cb75b3e24\gennt.exe

Filesize
144KB

MD5
37d8bced898bf955130f39645eba3f0a

SHA1
c411ffa43ad7cf7bf321017e9a2d7d9bae1f0cf5

SHA256
1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9

SHA512
1ae8c515a0a820552c8861fdde197dee0ea0f7fabae74ee4fac9c345f0e1dadf5448b0787cbedfa9e960980419dd3f59fbb8cae8da84df74283348ac80554eaa

Download Submit
memory/2636-147-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/4260-133-0x0000000005B50000-0x0000000005BEC000-memory.dmp

Filesize
624KB

Download
memory/4260-130-0x0000000000480000-0x00000000004AA000-memory.dmp

Filesize
168KB

Download
memory/4260-132-0x0000000004E50000-0x0000000004EE2000-memory.dmp

Filesize
584KB

Download
memory/4260-131-0x0000000005300000-0x00000000058A4000-memory.dmp

Filesize
5.6MB

Download
memory/4992-138-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/4992-137-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/4992-135-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download

Analysis

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