buer | 1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9

Analysis

max time kernel
146s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
25/05/2022, 01:49

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9.exe
Size 144KB
Sample220525-b812bsaghm
SHA256 1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9
MD5 37d8bced898bf955130f39645eba3f0a
SHA1 c411ffa43ad7cf7bf321017e9a2d7d9bae1f0cf5
SHA512 1ae8c515a0a820552c8861fdde197dee0ea0f7fabae74ee4fac9c345f0e1dadf5448b0787cbedfa9e960980419dd3f59fbb8cae8da84df74283348ac80554eaa
MD5 SHA1 SHA512

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

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

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

gennt.exe

Path C:\ProgramData\cfb2287ad52cb75b3e24\gennt.exe
Size 144KB
SHA256 1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9
MD5 37d8bced898bf955130f39645eba3f0a
SHA1 c411ffa43ad7cf7bf321017e9a2d7d9bae1f0cf5
SHA512 1ae8c515a0a820552c8861fdde197dee0ea0f7fabae74ee4fac9c345f0e1dadf5448b0787cbedfa9e960980419dd3f59fbb8cae8da84df74283348ac80554eaa
SSDEEP 3072:tEsYfPCSnRGgwytStXF5FrCcVyMjYyID+rrUZBE92QL7X:ajHWdyYtcMjDID+nUZBE92QP
MD5 SHA1 SHA512 SSDEEP

Submit Download

gennt.exe

Path C:\ProgramData\cfb2287ad52cb75b3e24\gennt.exe
Size 144KB
SHA256 1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9
MD5 37d8bced898bf955130f39645eba3f0a
SHA1 c411ffa43ad7cf7bf321017e9a2d7d9bae1f0cf5
SHA512 1ae8c515a0a820552c8861fdde197dee0ea0f7fabae74ee4fac9c345f0e1dadf5448b0787cbedfa9e960980419dd3f59fbb8cae8da84df74283348ac80554eaa
SSDEEP 3072:tEsYfPCSnRGgwytStXF5FrCcVyMjYyID+rrUZBE92QL7X:ajHWdyYtcMjDID+nUZBE92QP
MD5 SHA1 SHA512 SSDEEP

Submit Download

gennt.exe

Path C:\ProgramData\cfb2287ad52cb75b3e24\gennt.exe
Size 144KB
SHA256 1c6852799eabf0c9e744016a3113af6d1185c3de41acdbf90c95297d252d01f9
MD5 37d8bced898bf955130f39645eba3f0a
SHA1 c411ffa43ad7cf7bf321017e9a2d7d9bae1f0cf5
SHA512 1ae8c515a0a820552c8861fdde197dee0ea0f7fabae74ee4fac9c345f0e1dadf5448b0787cbedfa9e960980419dd3f59fbb8cae8da84df74283348ac80554eaa
SSDEEP 3072:tEsYfPCSnRGgwytStXF5FrCcVyMjYyID+rrUZBE92QL7X:ajHWdyYtcMjDID+nUZBE92QP
MD5 SHA1 SHA512 SSDEEP

Submit Download

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

Download

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

Download

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

Download

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

Download

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

Download

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

Download

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

Download

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

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads