e9cd80b16d9c424ea632a20e0adefa7852708f0d671cccf644b15cf288754021

Analysis

max time kernel
144s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
25-12-2023 02:38

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General

Target

006575179789887d62d2ee8b5ba820b5.dll
Size

237KB
MD5

006575179789887d62d2ee8b5ba820b5
SHA1

980772976812c7ef3d644645165b5ea33ff34c0b
SHA256

e9cd80b16d9c424ea632a20e0adefa7852708f0d671cccf644b15cf288754021
SHA512

88eeac529607f50f8341f436ec871cd462081c8f9b25249684f89a8c3e780ec7fa83d03f2f5e4752b354faffbbff3199802d62455269bfa721991bb06f8f0016
SSDEEP

1536:XeHcpAz1xBApIP95YywPgBiUqrklgWhKHkDK9vj6gKLuf50/vQODGsGDwkk0t:eVz1xBApIP95RiUMWXm9vkuR0/4PwkLt

Score

10^/10

persistence

Malware Config

Signatures

Adds autorun key to be loaded by Explorer.exe on startup 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad\lxdsxxefo = "{13b21909-9b3a-e08f-ac4b-9b3a9181ccd7}"	rundll32.exe

Loads dropped DLL 2 IoCs

pid	Process
4252	rundll32.exe
4252	rundll32.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\kwcrwwden.dll	rundll32.exe
File created	C:\Windows\SysWOW64\gsynsszaj.dll	rundll32.exe
File created	C:\Windows\SysWOW64\ykqfkkrsb.dll	rundll32.exe
File opened for modification	C:\Windows\SysWOW64\ykqfkkrsb.dll	rundll32.exe

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{13b21909-9b3a-e08f-ac4b-9b3a9181ccd7}	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{13b21909-9b3a-e08f-ac4b-9b3a9181ccd7}\	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{13b21909-9b3a-e08f-ac4b-9b3a9181ccd7}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{13b21909-9b3a-e08f-ac4b-9b3a9181ccd7}\InprocServer32\ = "C:\\Windows\\SysWow64\\gsynsszaj.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{13b21909-9b3a-e08f-ac4b-9b3a9181ccd7}\InprocServer32\ThreadingModel = "Apartment"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4252	rundll32.exe
4252	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4252	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4252	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1080 wrote to memory of 4252	1080	rundll32.exe	14
PID 1080 wrote to memory of 4252	1080	rundll32.exe	14
PID 1080 wrote to memory of 4252	1080	rundll32.exe	14

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\006575179789887d62d2ee8b5ba820b5.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1080
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\006575179789887d62d2ee8b5ba820b5.dll,#1
  2⤵
  - Adds autorun key to be loaded by Explorer.exe on startup
  - Loads dropped DLL
  - Drops file in System32 directory
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:4252

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\SysWOW64\ykqfkkrsb.dll

Filesize
98KB

MD5
e37c0a10ce68382b9f1ebd9d8a1e37be

SHA1
a8cf53702660d1f737c6f3e3bf8674a06b75b04d

SHA256
45f0a0e0c871a6acf472b943793d72363a025ab7ecd787117bcadb5640d87b92

SHA512
5d10d8f1c531bacb5226cf1c4814c5ed21c979f2337b539804ccbbfcd0738314107d76302fc7d780bc99e78474a32256985eab4c7a031d3ad11984e62e6f39a9

Download Submit
C:\Windows\SysWOW64\ykqfkkrsb.dll

Filesize
92KB

MD5
4ebed6c51f16a21ee90f274f4cd04dcb

SHA1
8c282c4642d351d0ed0c4a15760c2c3357d1d2a8

SHA256
b31a8efdfe1a6cfa511e271bdb8200288e2c8d9c7e75dc95f19b3e1942e20704

SHA512
8eb76e45855581ccf2e3bd0713a0e0beb79d9dbb2a6265ae3d84c7059c238a5934be4e9884bb796b8f51aad317af8087597790f9c8adfd246572c0128c8fbb49

Download Submit
memory/4252-15-0x0000000077940000-0x0000000077A30000-memory.dmp

Filesize
960KB

Download
memory/4252-17-0x0000000075C90000-0x0000000075D0A000-memory.dmp

Filesize
488KB

Download
memory/4252-14-0x0000000077940000-0x0000000077A30000-memory.dmp

Filesize
960KB

Download
memory/4252-13-0x0000000077940000-0x0000000077A30000-memory.dmp

Filesize
960KB

Download
memory/4252-9-0x0000000075C90000-0x0000000075D0A000-memory.dmp

Filesize
488KB

Download
memory/4252-7-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/4252-20-0x0000000075C90000-0x0000000075D0A000-memory.dmp

Filesize
488KB

Download
memory/4252-19-0x0000000077940000-0x0000000077A30000-memory.dmp

Filesize
960KB

Download
memory/4252-18-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download