buer | 422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579

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\\b62ed3ea95696e036e03\\AutoReg.exe\""	AutoReg.exe

Executes dropped EXE 2 IoCs

pid	Process
760	AutoReg.exe
832	AutoReg.exe

Loads dropped DLL 2 IoCs

pid	Process
3840	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe
760	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)	\??\E:	AutoReg.exe
File opened (read-only)	\??\F:	AutoReg.exe
File opened (read-only)	\??\G:	AutoReg.exe
File opened (read-only)	\??\I:	AutoReg.exe
File opened (read-only)	\??\O:	AutoReg.exe
File opened (read-only)	\??\Q:	AutoReg.exe
File opened (read-only)	\??\T:	AutoReg.exe
File opened (read-only)	\??\U:	AutoReg.exe
File opened (read-only)	\??\W:	AutoReg.exe
File opened (read-only)	\??\X:	AutoReg.exe
File opened (read-only)	\??\Z:	AutoReg.exe
File opened (read-only)	\??\A:	AutoReg.exe
File opened (read-only)	\??\P:	AutoReg.exe
File opened (read-only)	\??\B:	AutoReg.exe
File opened (read-only)	\??\R:	AutoReg.exe
File opened (read-only)	\??\Y:	AutoReg.exe
File opened (read-only)	\??\H:	AutoReg.exe
File opened (read-only)	\??\J:	AutoReg.exe
File opened (read-only)	\??\K:	AutoReg.exe
File opened (read-only)	\??\L:	AutoReg.exe
File opened (read-only)	\??\M:	AutoReg.exe
File opened (read-only)	\??\N:	AutoReg.exe
File opened (read-only)	\??\S:	AutoReg.exe
File opened (read-only)	\??\V:	AutoReg.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3840 set thread context of 524	3840	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	81
PID 760 set thread context of 832	760	AutoReg.exe	83

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
1268	400	WerFault.exe	84

NSIS installer 6 IoCs

installer

resource	yara_rule
behavioral2/files/0x00060000000231b5-133.dat	nsis_installer_1
behavioral2/files/0x00060000000231b5-133.dat	nsis_installer_2
behavioral2/files/0x00060000000231b5-134.dat	nsis_installer_1
behavioral2/files/0x00060000000231b5-134.dat	nsis_installer_2
behavioral2/files/0x00060000000231b5-138.dat	nsis_installer_1
behavioral2/files/0x00060000000231b5-138.dat	nsis_installer_2

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1428	powershell.exe
1428	powershell.exe
832	AutoReg.exe
832	AutoReg.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
3840	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe
760	AutoReg.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1428	powershell.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 3840 wrote to memory of 524	3840	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	81
PID 3840 wrote to memory of 524	3840	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	81
PID 3840 wrote to memory of 524	3840	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	81
PID 3840 wrote to memory of 524	3840	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	81
PID 524 wrote to memory of 760	524	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	82
PID 524 wrote to memory of 760	524	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	82
PID 524 wrote to memory of 760	524	422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe	82
PID 760 wrote to memory of 832	760	AutoReg.exe	83
PID 760 wrote to memory of 832	760	AutoReg.exe	83
PID 760 wrote to memory of 832	760	AutoReg.exe	83
PID 760 wrote to memory of 832	760	AutoReg.exe	83
PID 832 wrote to memory of 400	832	AutoReg.exe	84
PID 832 wrote to memory of 400	832	AutoReg.exe	84
PID 832 wrote to memory of 400	832	AutoReg.exe	84
PID 832 wrote to memory of 400	832	AutoReg.exe	84
PID 832 wrote to memory of 400	832	AutoReg.exe	84
PID 832 wrote to memory of 400	832	AutoReg.exe	84
PID 832 wrote to memory of 400	832	AutoReg.exe	84
PID 832 wrote to memory of 400	832	AutoReg.exe	84
PID 832 wrote to memory of 400	832	AutoReg.exe	84
PID 832 wrote to memory of 400	832	AutoReg.exe	84
PID 832 wrote to memory of 1428	832	AutoReg.exe	88
PID 832 wrote to memory of 1428	832	AutoReg.exe	88
PID 832 wrote to memory of 1428	832	AutoReg.exe	88

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:3840
- C:\Users\Admin\AppData\Local\Temp\422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe
  "C:\Users\Admin\AppData\Local\Temp\422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:524
- - C:\ProgramData\b62ed3ea95696e036e03\AutoReg.exe
    C:\ProgramData\b62ed3ea95696e036e03\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:760
  - - C:\ProgramData\b62ed3ea95696e036e03\AutoReg.exe
      C:\ProgramData\b62ed3ea95696e036e03\AutoReg.exe "C:\Users\Admin\AppData\Local\Temp\422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579.exe" ensgJJ
      4⤵
      Modifies WinLogon for persistence
      Executes dropped EXE
      Enumerates connected drives
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of WriteProcessMemory
      PID:832
    - - C:\Windows\SysWOW64\secinit.exe
        
        C:\ProgramData\b62ed3ea95696e036e03\AutoReg.exe
        5⤵
        
        PID:400
      - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 400 -s 452
        6⤵
        Program crash
        
        PID:1268
    - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\b62ed3ea95696e036e03}"
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1428

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 400 -ip 400
1⤵
PID:1300

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

Peripheral Device Discovery

Query Registry

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\b62ed3ea95696e036e03\AutoReg.exe

Filesize
395KB

MD5
21ca840d524b862b43421ce8119ca7a8

SHA1
da7271cd8618d4edb72fa704c82e8b7e53c2e9a8

SHA256
422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579

SHA512
4fcb8916e825193eb38983357dfd7f2b8c979d918257dc4dfc7e7a8f5330274eb4ef747766650affd564b65b3e39c8e876c43ec6a542cfbf47452cb490ccb9ac

Download Submit
C:\ProgramData\b62ed3ea95696e036e03\AutoReg.exe

Filesize
395KB

MD5
21ca840d524b862b43421ce8119ca7a8

SHA1
da7271cd8618d4edb72fa704c82e8b7e53c2e9a8

SHA256
422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579

SHA512
4fcb8916e825193eb38983357dfd7f2b8c979d918257dc4dfc7e7a8f5330274eb4ef747766650affd564b65b3e39c8e876c43ec6a542cfbf47452cb490ccb9ac

Download Submit
C:\ProgramData\b62ed3ea95696e036e03\AutoReg.exe

Filesize
395KB

MD5
21ca840d524b862b43421ce8119ca7a8

SHA1
da7271cd8618d4edb72fa704c82e8b7e53c2e9a8

SHA256
422c8805c090ca0e7bf7b53ee5c0a2d66c2e1d38ab54797d7c46ce72cf0d5579

SHA512
4fcb8916e825193eb38983357dfd7f2b8c979d918257dc4dfc7e7a8f5330274eb4ef747766650affd564b65b3e39c8e876c43ec6a542cfbf47452cb490ccb9ac

Download Submit
C:\Users\Admin\AppData\Local\Temp\nshC058.tmp\System.dll

Filesize
11KB

MD5
fccff8cb7a1067e23fd2e2b63971a8e1

SHA1
30e2a9e137c1223a78a0f7b0bf96a1c361976d91

SHA256
6fcea34c8666b06368379c6c402b5321202c11b00889401c743fb96c516c679e

SHA512
f4335e84e6f8d70e462a22f1c93d2998673a7616c868177cac3e8784a3be1d7d0bb96f2583fa0ed82f4f2b6b8f5d9b33521c279a42e055d80a94b4f3f1791e0c

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsp8775.tmp\System.dll

Filesize
11KB

MD5
fccff8cb7a1067e23fd2e2b63971a8e1

SHA1
30e2a9e137c1223a78a0f7b0bf96a1c361976d91

SHA256
6fcea34c8666b06368379c6c402b5321202c11b00889401c743fb96c516c679e

SHA512
f4335e84e6f8d70e462a22f1c93d2998673a7616c868177cac3e8784a3be1d7d0bb96f2583fa0ed82f4f2b6b8f5d9b33521c279a42e055d80a94b4f3f1791e0c

Download Submit
C:\Users\Admin\AppData\Roaming\6339518

Filesize
247KB

MD5
fe99bfe4249b2fc154b1c2bb0de4f558

SHA1
8e1dc813f9f76f315af49f47a288cac79fac1542

SHA256
0d119d6836ba5b2e2f3c925b7929a4c397f3a5cc5aa6ecdd74f712a639226e6f

SHA512
ffc8c6e3526371015c65a297e24cce9e391443e29d7ffda8eedfd63271a858f44ea6fa233346403d0a7887f376ea19d7a97bafc63f112feaa9406060f5b3c4d8

Download Submit
memory/1428-144-0x00000000053A0000-0x0000000005406000-memory.dmp

Filesize
408KB

Download
memory/1428-149-0x00000000746F0000-0x000000007473C000-memory.dmp

Filesize
304KB

Download
memory/1428-142-0x0000000004CC0000-0x00000000052E8000-memory.dmp

Filesize
6.2MB

Download
memory/1428-143-0x0000000004BB0000-0x0000000004BD2000-memory.dmp

Filesize
136KB

Download
memory/1428-145-0x0000000005480000-0x00000000054E6000-memory.dmp

Filesize
408KB

Download
memory/1428-146-0x0000000005AE0000-0x0000000005AFE000-memory.dmp

Filesize
120KB

Download
memory/1428-147-0x00000000025C5000-0x00000000025C7000-memory.dmp

Filesize
8KB

Download
memory/1428-148-0x00000000060B0000-0x00000000060E2000-memory.dmp

Filesize
200KB

Download
memory/1428-141-0x00000000024A0000-0x00000000024D6000-memory.dmp

Filesize
216KB

Download
memory/1428-150-0x0000000006090000-0x00000000060AE000-memory.dmp

Filesize
120KB

Download
memory/1428-151-0x0000000007430000-0x0000000007AAA000-memory.dmp

Filesize
6.5MB

Download
memory/1428-152-0x0000000006DE0000-0x0000000006DFA000-memory.dmp

Filesize
104KB

Download
memory/1428-153-0x0000000006E60000-0x0000000006E6A000-memory.dmp

Filesize
40KB

Download
memory/1428-154-0x0000000007060000-0x00000000070F6000-memory.dmp

Filesize
600KB

Download
memory/1428-155-0x0000000007010000-0x000000000701E000-memory.dmp

Filesize
56KB

Download
memory/1428-156-0x0000000007120000-0x000000000713A000-memory.dmp

Filesize
104KB

Download
memory/1428-157-0x0000000007100000-0x0000000007108000-memory.dmp

Filesize
32KB

Download

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