55af1ee79176f2503dc6cee5464344e6bbcaa4e37b4ae7217922c8e56ec395cf

Resubmissions

22/09/2022, 11:18

220922-nektgabcf6 10

22/09/2022, 11:03

220922-m5pdxafacl 10

Analysis

max time kernel
207s
max time network
92s
platform
windows7_x64
resource
win7-20220901-en
resource tags

arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
submitted
22/09/2022, 11:18

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General

Target

keyauth Bypass‮nls..scr
Size

2.6MB
MD5

5361a2f1d174599ebc5b6cc31daf86f2
SHA1

ade74d0abac77203629b81513a739f11b39a52ef
SHA256

55af1ee79176f2503dc6cee5464344e6bbcaa4e37b4ae7217922c8e56ec395cf
SHA512

96381c583b975e4c2cd7ec70bd955936c48a9737036234241e37e73baf81c96cb28ab28d2fe3c53ed1e8ce0be641fba653d7e6877770cb8f60fb32f2c7b703b4
SSDEEP

49152:j8ASxr7FEi5LbunhHpj5G3FVhIdag5SNHeGJWrz:jTSt7FEGnCdpj5G3FVq18gGJ

Score

10^/10

persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoftt\\DefenderProtector.exe\","	keyauth Bypass‮nls..scr

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Modifies registry class 10 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sln_auto_file\	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\.sln\ = "sln_auto_file"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sln_auto_file\shell\Read	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sln_auto_file\shell\Read\command\ = "\"C:\\Program Files (x86)\\Adobe\\Reader 9.0\\Reader\\AcroRd32.exe\" \"%1\""	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_Classes\Local Settings	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\MuiCache	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sln_auto_file\shell	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sln_auto_file\shell\Read\command	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\sln_auto_file	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000_CLASSES\.sln	rundll32.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1448	keyauth Bypass‮nls..scr
1448	keyauth Bypass‮nls..scr
1448	keyauth Bypass‮nls..scr

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1132	AcroRd32.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1448	keyauth Bypass‮nls..scr
Token: SeDebugPrivilege	1392	Explorer.EXE

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
1132	AcroRd32.exe
1132	AcroRd32.exe
1132	AcroRd32.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1448 wrote to memory of 320	1448	keyauth Bypass‮nls..scr	27
PID 1448 wrote to memory of 320	1448	keyauth Bypass‮nls..scr	27
PID 1448 wrote to memory of 320	1448	keyauth Bypass‮nls..scr	27
PID 320 wrote to memory of 1132	320	rundll32.exe	28
PID 320 wrote to memory of 1132	320	rundll32.exe	28
PID 320 wrote to memory of 1132	320	rundll32.exe	28
PID 320 wrote to memory of 1132	320	rundll32.exe	28
PID 1448 wrote to memory of 1392	1448	keyauth Bypass‮nls..scr	14

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1392
- C:\Users\Admin\AppData\Local\Temp\keyauth Bypass‮nls..scr
  "C:\Users\Admin\AppData\Local\Temp\keyauth Bypass‮nls..scr" /S
  2⤵
  - Modifies WinLogon for persistence
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1448
- - C:\Windows\system32\rundll32.exe
    "C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\Gngwnbcqyucvbwsgwyojoproject.sln
    3⤵
    - Modifies registry class
    - Suspicious use of WriteProcessMemory
    PID:320
  - - C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe
      "C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe" "C:\Users\Admin\AppData\Local\Temp\Gngwnbcqyucvbwsgwyojoproject.sln"
      4⤵
      Suspicious behavior: GetForegroundWindowSpam
      Suspicious use of SetWindowsHookEx
      PID:1132

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Web Service

T1102

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\Gngwnbcqyucvbwsgwyojoproject.sln

Filesize
1KB

MD5
aeee58518da7889951bf8aae1696ce79

SHA1
a7fe2d1ca76bbdf519a724baf714cb53341617ac

SHA256
e85a8310a266e15e043261400ef7caef5f19d5fb60fff0c359db292d172e2ca7

SHA512
f54e34e805225b7d56e1a9a48b5f41939c4a525dfdd9d8f718161794f66bcfb66459689738615be8eccd54998ec173c24b565c8252b09ca0e23c62117f18b77b

Download Submit
memory/320-57-0x000007FEFB9E1000-0x000007FEFB9E3000-memory.dmp

Filesize
8KB

Download
memory/1132-60-0x00000000758B1000-0x00000000758B3000-memory.dmp

Filesize
8KB

Download
memory/1392-65-0x0000000006940000-0x000000000699C000-memory.dmp

Filesize
368KB

Download
memory/1448-58-0x00000000022C7000-0x00000000022E6000-memory.dmp

Filesize
124KB

Download
memory/1448-54-0x0000000000BD0000-0x0000000000E70000-memory.dmp

Filesize
2.6MB

Download
memory/1448-55-0x000000001B120000-0x000000001B384000-memory.dmp

Filesize
2.4MB

Download
memory/1448-62-0x0000000077190000-0x0000000077339000-memory.dmp

Filesize
1.7MB

Download
memory/1448-63-0x0000000077190000-0x0000000077339000-memory.dmp

Filesize
1.7MB

Download
memory/1448-64-0x00000000022C7000-0x00000000022E6000-memory.dmp

Filesize
124KB

Download
memory/1448-66-0x00000000022C7000-0x00000000022E6000-memory.dmp

Filesize
124KB

Download
memory/1448-67-0x0000000077190000-0x0000000077339000-memory.dmp

Filesize
1.7MB

Download