buer | 422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579

Analysis

max time kernel
98s
max time network
102s
platform
windows7_x64
resource
win7-20220414-en
submitted
15-04-2022 05:42

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General

Target

422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe
Size

395KB
MD5

21ca840d524b862b43421ce8119ca7a8
SHA1

da7271cd8618d4edb72fa704c82e8b7e53c2e9a8
SHA256

422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579
SHA512

4fcb8916e825193eb38983357dfd7f2b8c979d918257dc4dfc7e7a8f5330274eb4ef747766650affd564b65b3e39c8e876c43ec6a542cfbf47452cb490ccb9ac

Score

10^/10

buer loader persistence

Malware Config

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\\5085c287f2253d50ffa8\\AutoReg.exe\""	AutoReg.exe

Executes dropped EXE 2 IoCs

pid	Process
1748	AutoReg.exe
1772	AutoReg.exe

Deletes itself 1 IoCs

pid	Process
1772	AutoReg.exe

Loads dropped DLL 4 IoCs

pid	Process
1092	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe
1260	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe
1748	AutoReg.exe
1748	AutoReg.exe

Enumerates connected drives 3 TTPs 24 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\H:	AutoReg.exe
File opened (read-only)	\??\I:	AutoReg.exe
File opened (read-only)	\??\K:	AutoReg.exe
File opened (read-only)	\??\L:	AutoReg.exe
File opened (read-only)	\??\O:	AutoReg.exe
File opened (read-only)	\??\A:	AutoReg.exe
File opened (read-only)	\??\B:	AutoReg.exe
File opened (read-only)	\??\F:	AutoReg.exe
File opened (read-only)	\??\V:	AutoReg.exe
File opened (read-only)	\??\X:	AutoReg.exe
File opened (read-only)	\??\E:	AutoReg.exe
File opened (read-only)	\??\M:	AutoReg.exe
File opened (read-only)	\??\P:	AutoReg.exe
File opened (read-only)	\??\Y:	AutoReg.exe
File opened (read-only)	\??\Z:	AutoReg.exe
File opened (read-only)	\??\G:	AutoReg.exe
File opened (read-only)	\??\U:	AutoReg.exe
File opened (read-only)	\??\W:	AutoReg.exe
File opened (read-only)	\??\R:	AutoReg.exe
File opened (read-only)	\??\S:	AutoReg.exe
File opened (read-only)	\??\T:	AutoReg.exe
File opened (read-only)	\??\J:	AutoReg.exe
File opened (read-only)	\??\N:	AutoReg.exe
File opened (read-only)	\??\Q:	AutoReg.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1092 set thread context of 1260	1092	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	27
PID 1748 set thread context of 1772	1748	AutoReg.exe	29

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1240	1776	WerFault.exe	30

NSIS installer 10 IoCs

installer

resource	yara_rule
behavioral1/files/0x000600000001467b-58.dat	nsis_installer_1
behavioral1/files/0x000600000001467b-58.dat	nsis_installer_2
behavioral1/files/0x000600000001467b-60.dat	nsis_installer_1
behavioral1/files/0x000600000001467b-60.dat	nsis_installer_2
behavioral1/files/0x000600000001467b-62.dat	nsis_installer_1
behavioral1/files/0x000600000001467b-62.dat	nsis_installer_2
behavioral1/files/0x000600000001467b-65.dat	nsis_installer_1
behavioral1/files/0x000600000001467b-65.dat	nsis_installer_2
behavioral1/files/0x000600000001467b-67.dat	nsis_installer_1
behavioral1/files/0x000600000001467b-67.dat	nsis_installer_2

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
700	powershell.exe
1772	AutoReg.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
1092	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe
1748	AutoReg.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	700	powershell.exe

Suspicious use of WriteProcessMemory 42 IoCs

description	pid	Process	procid_target
PID 1092 wrote to memory of 1260	1092	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	27
PID 1092 wrote to memory of 1260	1092	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	27
PID 1092 wrote to memory of 1260	1092	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	27
PID 1092 wrote to memory of 1260	1092	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	27
PID 1092 wrote to memory of 1260	1092	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	27
PID 1092 wrote to memory of 1260	1092	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	27
PID 1092 wrote to memory of 1260	1092	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	27
PID 1092 wrote to memory of 1260	1092	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	27
PID 1260 wrote to memory of 1748	1260	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	28
PID 1260 wrote to memory of 1748	1260	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	28
PID 1260 wrote to memory of 1748	1260	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	28
PID 1260 wrote to memory of 1748	1260	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	28
PID 1260 wrote to memory of 1748	1260	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	28
PID 1260 wrote to memory of 1748	1260	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	28
PID 1260 wrote to memory of 1748	1260	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	28
PID 1748 wrote to memory of 1772	1748	AutoReg.exe	29
PID 1748 wrote to memory of 1772	1748	AutoReg.exe	29
PID 1748 wrote to memory of 1772	1748	AutoReg.exe	29
PID 1748 wrote to memory of 1772	1748	AutoReg.exe	29
PID 1748 wrote to memory of 1772	1748	AutoReg.exe	29
PID 1748 wrote to memory of 1772	1748	AutoReg.exe	29
PID 1748 wrote to memory of 1772	1748	AutoReg.exe	29
PID 1748 wrote to memory of 1772	1748	AutoReg.exe	29
PID 1772 wrote to memory of 1776	1772	AutoReg.exe	30
PID 1772 wrote to memory of 1776	1772	AutoReg.exe	30
PID 1772 wrote to memory of 1776	1772	AutoReg.exe	30
PID 1772 wrote to memory of 1776	1772	AutoReg.exe	30
PID 1772 wrote to memory of 1776	1772	AutoReg.exe	30
PID 1772 wrote to memory of 1776	1772	AutoReg.exe	30
PID 1772 wrote to memory of 1776	1772	AutoReg.exe	30
PID 1772 wrote to memory of 1776	1772	AutoReg.exe	30
PID 1772 wrote to memory of 1776	1772	AutoReg.exe	30
PID 1772 wrote to memory of 1776	1772	AutoReg.exe	30
PID 1772 wrote to memory of 1776	1772	AutoReg.exe	30
PID 1776 wrote to memory of 1240	1776	secinit.exe	31
PID 1776 wrote to memory of 1240	1776	secinit.exe	31
PID 1776 wrote to memory of 1240	1776	secinit.exe	31
PID 1776 wrote to memory of 1240	1776	secinit.exe	31
PID 1772 wrote to memory of 700	1772	AutoReg.exe	32
PID 1772 wrote to memory of 700	1772	AutoReg.exe	32
PID 1772 wrote to memory of 700	1772	AutoReg.exe	32
PID 1772 wrote to memory of 700	1772	AutoReg.exe	32

C:\Users\Admin\AppData\Local\Temp\422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe
"C:\Users\Admin\AppData\Local\Temp\422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1092
- C:\Users\Admin\AppData\Local\Temp\422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe
  "C:\Users\Admin\AppData\Local\Temp\422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1260
- - C:\ProgramData\5085c287f2253d50ffa8\AutoReg.exe
    C:\ProgramData\5085c287f2253d50ffa8\AutoReg.exe "C:\Users\Admin\AppData\Local\Temp\422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe" ensgJJ
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Suspicious use of SetThreadContext
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of WriteProcessMemory
    PID:1748
  - - C:\ProgramData\5085c287f2253d50ffa8\AutoReg.exe
      C:\ProgramData\5085c287f2253d50ffa8\AutoReg.exe "C:\Users\Admin\AppData\Local\Temp\422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe" ensgJJ
      4⤵
      Modifies WinLogon for persistence
      Executes dropped EXE
      Deletes itself
      Enumerates connected drives
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of WriteProcessMemory
      PID:1772
    - - C:\Windows\SysWOW64\secinit.exe
        
        C:\ProgramData\5085c287f2253d50ffa8\AutoReg.exe
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1776
      - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 1776 -s 200
        6⤵
        Program crash
        
        PID:1240
    - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\5085c287f2253d50ffa8}"
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:700

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\5085c287f2253d50ffa8\AutoReg.exe

Filesize
395KB

MD5
21ca840d524b862b43421ce8119ca7a8

SHA1
da7271cd8618d4edb72fa704c82e8b7e53c2e9a8

SHA256
422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579

SHA512
4fcb8916e825193eb38983357dfd7f2b8c979d918257dc4dfc7e7a8f5330274eb4ef747766650affd564b65b3e39c8e876c43ec6a542cfbf47452cb490ccb9ac

Download Submit
C:\ProgramData\5085c287f2253d50ffa8\AutoReg.exe

Filesize
395KB

MD5
21ca840d524b862b43421ce8119ca7a8

SHA1
da7271cd8618d4edb72fa704c82e8b7e53c2e9a8

SHA256
422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579

SHA512
4fcb8916e825193eb38983357dfd7f2b8c979d918257dc4dfc7e7a8f5330274eb4ef747766650affd564b65b3e39c8e876c43ec6a542cfbf47452cb490ccb9ac

Download Submit
C:\ProgramData\5085c287f2253d50ffa8\AutoReg.exe

Filesize
395KB

MD5
21ca840d524b862b43421ce8119ca7a8

SHA1
da7271cd8618d4edb72fa704c82e8b7e53c2e9a8

SHA256
422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579

SHA512
4fcb8916e825193eb38983357dfd7f2b8c979d918257dc4dfc7e7a8f5330274eb4ef747766650affd564b65b3e39c8e876c43ec6a542cfbf47452cb490ccb9ac

Download Submit
\ProgramData\5085c287f2253d50ffa8\AutoReg.exe

Filesize
395KB

MD5
21ca840d524b862b43421ce8119ca7a8

SHA1
da7271cd8618d4edb72fa704c82e8b7e53c2e9a8

SHA256
422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579

SHA512
4fcb8916e825193eb38983357dfd7f2b8c979d918257dc4dfc7e7a8f5330274eb4ef747766650affd564b65b3e39c8e876c43ec6a542cfbf47452cb490ccb9ac

Download Submit
\ProgramData\5085c287f2253d50ffa8\AutoReg.exe

Filesize
395KB

MD5
21ca840d524b862b43421ce8119ca7a8

SHA1
da7271cd8618d4edb72fa704c82e8b7e53c2e9a8

SHA256
422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579

SHA512
4fcb8916e825193eb38983357dfd7f2b8c979d918257dc4dfc7e7a8f5330274eb4ef747766650affd564b65b3e39c8e876c43ec6a542cfbf47452cb490ccb9ac

Download Submit
\Users\Admin\AppData\Local\Temp\nsj699E.tmp\System.dll

Filesize
11KB

MD5
fccff8cb7a1067e23fd2e2b63971a8e1

SHA1
30e2a9e137c1223a78a0f7b0bf96a1c361976d91

SHA256
6fcea34c8666b06368379c6c402b5321202c11b00889401c743fb96c516c679e

SHA512
f4335e84e6f8d70e462a22f1c93d2998673a7616c868177cac3e8784a3be1d7d0bb96f2583fa0ed82f4f2b6b8f5d9b33521c279a42e055d80a94b4f3f1791e0c

Download Submit
\Users\Admin\AppData\Local\Temp\nso141F.tmp\System.dll

Filesize
11KB

MD5
fccff8cb7a1067e23fd2e2b63971a8e1

SHA1
30e2a9e137c1223a78a0f7b0bf96a1c361976d91

SHA256
6fcea34c8666b06368379c6c402b5321202c11b00889401c743fb96c516c679e

SHA512
f4335e84e6f8d70e462a22f1c93d2998673a7616c868177cac3e8784a3be1d7d0bb96f2583fa0ed82f4f2b6b8f5d9b33521c279a42e055d80a94b4f3f1791e0c

Download Submit
memory/700-86-0x0000000073710000-0x0000000073CBB000-memory.dmp

Filesize
5.7MB

Download
memory/700-87-0x0000000002522000-0x0000000002524000-memory.dmp

Filesize
8KB

Download
memory/1092-54-0x0000000075F61000-0x0000000075F63000-memory.dmp

Filesize
8KB

Download
memory/1776-70-0x0000000000100000-0x0000000000155000-memory.dmp

Filesize
340KB

Download
memory/1776-79-0x0000000000080000-0x0000000000081000-memory.dmp

Filesize
4KB

Download
memory/1776-77-0x0000000000080000-0x0000000000081000-memory.dmp

Filesize
4KB

Download
memory/1776-75-0x0000000000100000-0x0000000000155000-memory.dmp

Filesize
340KB

Download
memory/1776-74-0x0000000000100000-0x0000000000155000-memory.dmp

Filesize
340KB

Download
memory/1776-72-0x0000000000100000-0x0000000000155000-memory.dmp

Filesize
340KB

Download
memory/1776-69-0x0000000000100000-0x0000000000155000-memory.dmp

Filesize
340KB

Download