ee3e04171308b5c8fae57344a095285e83c10b942745f27f4696a01cd2b16678

Analysis

max time kernel
147s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
07-12-2024 20:19

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General

Target

$TEMP/windll.dll
Size

84KB
MD5

a20e8c18d8c26630407ca9a20dfe3ea9
SHA1

e5a28f8452144da79e09dfdff658a8ecb3c3e222
SHA256

8fe1124a3283b484243bf781c42b3361f7ad55c495f41e9b9868e719d3f1e497
SHA512

8475e142da0ec7ce5c9fb3b70e110e78670b3690f323cbfcfd5373dd954a8ca23c2d0e7d9a35befbccc5247d551a1bd9b92642a9d61018514a708fbc05fcaa0e
SSDEEP

1536:5blyFuzuyuFw1q3Hc96EBUdiTMKTg0gfxunQ9SIq7S6Eo1tRf0xHn:5blpzWzXc0kUmPMNZunQ9CH1tmx

Score

10^/10

discovery persistence

Malware Config

Signatures

Adds autorun key to be loaded by Explorer.exe on startup 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad\WorkOffline = "{b554314f-f6b3-4b75-9fc4-b5b38a2961db}"	regsvr32.exe

Loads dropped DLL 2 IoCs

pid	Process
2252	regsvr32.exe
2252	regsvr32.exe

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Common Files\Work\WorkOffline.dll	regsvr32.exe

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe

Modifies registry class 4 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{b554314f-f6b3-4b75-9fc4-b5b38a2961db}\InprocServer32\ThreadingModel = "Apartment"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{b554314f-f6b3-4b75-9fc4-b5b38a2961db}	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{b554314f-f6b3-4b75-9fc4-b5b38a2961db}\InprocServer32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{b554314f-f6b3-4b75-9fc4-b5b38a2961db}\InprocServer32\ = "C:\\Program Files (x86)\\Common Files\\Work\\WorkOffline.dll"	regsvr32.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
2252	regsvr32.exe
2252	regsvr32.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2252	regsvr32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2252	regsvr32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 348 wrote to memory of 2252	348	regsvr32.exe	82
PID 348 wrote to memory of 2252	348	regsvr32.exe	82
PID 348 wrote to memory of 2252	348	regsvr32.exe	82

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\$TEMP\windll.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:348
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\$TEMP\windll.dll
  2⤵
  - Adds autorun key to be loaded by Explorer.exe on startup
  - Loads dropped DLL
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  PID:2252

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Program Files (x86)\Common Files\Work\WorkOffline.dll

Filesize
84KB

MD5
a20e8c18d8c26630407ca9a20dfe3ea9

SHA1
e5a28f8452144da79e09dfdff658a8ecb3c3e222

SHA256
8fe1124a3283b484243bf781c42b3361f7ad55c495f41e9b9868e719d3f1e497

SHA512
8475e142da0ec7ce5c9fb3b70e110e78670b3690f323cbfcfd5373dd954a8ca23c2d0e7d9a35befbccc5247d551a1bd9b92642a9d61018514a708fbc05fcaa0e

Download Submit
memory/2252-5-0x0000000000930000-0x0000000000945000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads