ostap | c73aca0de369cd4add35941b558970267ae5076f71b2d4d88e5eb017b290ce95

General

Target

c73aca0de369cd4add35941b558970267ae5076f71b2d4d88e5eb017b290ce95.doc
Size

672KB
MD5

eb098a4d1233b6b5a19ecce55a93ccfd
SHA1

d6701cf4de368c0d998bd011b569ec656dd3d86c
SHA256

c73aca0de369cd4add35941b558970267ae5076f71b2d4d88e5eb017b290ce95
SHA512

096dc49c2eecf28e71cde8a3e87bfd3fd4bfc8a98ebf6838d7db74aee6a443afe79cac93ca1e390666f8155e0e5dbcd69c23656fb168ffa333e060da6b4b084c

Score

10^/10

Malware Config

Signatures

Ostap JavaScript Downloader 1 IoCs

Ostap is a JavaScript downloader that's been active since 2016. It's used to deliver several families, inluding TrickBot

resource	yara_rule
behavioral2/files/0x00080000000231b1-139.dat	family_ostap

Process spawned unexpected child process 1 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

description	pid	pid_target	Process	procid_target
Parent C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE is not expected to spawn this process	3500	2900	WScript.exe	79

ostap
Ostap is a JS downloader, used to deliver other families.
downloader ostap

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	WINWORD.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	WINWORD.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	WINWORD.EXE

Suspicious behavior: AddClipboardFormatListener 3 IoCs

pid	Process
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE

Suspicious use of FindShellTrayWindow 10 IoCs

pid	Process
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE

Suspicious use of SetWindowsHookEx 8 IoCs

pid	Process
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE
2900	WINWORD.EXE

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2900 wrote to memory of 1192	2900	WINWORD.EXE	82
PID 2900 wrote to memory of 1192	2900	WINWORD.EXE	82
PID 2900 wrote to memory of 3500	2900	WINWORD.EXE	90
PID 2900 wrote to memory of 3500	2900	WINWORD.EXE	90

C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE
"C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\c73aca0de369cd4add35941b558970267ae5076f71b2d4d88e5eb017b290ce95.doc" /o ""
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2900
- C:\Windows\splwow64.exe
  C:\Windows\splwow64.exe 12288
  2⤵
  PID:1192
- C:\Windows\System32\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Microsoft\drtfvt.hgfrtfrt.jse"
  2⤵
  - Process spawned unexpected child process
  PID:3500

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\drtfvt.hgfrtfrt.jse

Filesize
343KB

MD5
21c17fcee5fb7d707675a1aaeae5a1d7

SHA1
256b6ccda71f947fd8e27a0b526d29480399f808

SHA256
8c6e197fcb47a82410b94f1947c536e9f4c0c16e42f9d278f4f2792e4e50d556

SHA512
50cd17e44fbab55f9a14b568871bbaf0a38a50eb071fb0e58b9876a064a1321727cbceb6a9adcfa724436fa05eb56880a2cd11fe91bde90b6ced61cb6c3eee50

Download Submit
memory/2900-130-0x00007FFA92C10000-0x00007FFA92C20000-memory.dmp

Filesize
64KB

Download
memory/2900-132-0x00007FFA92C10000-0x00007FFA92C20000-memory.dmp

Filesize
64KB

Download
memory/2900-131-0x00007FFA92C10000-0x00007FFA92C20000-memory.dmp

Filesize
64KB

Download
memory/2900-133-0x00007FFA92C10000-0x00007FFA92C20000-memory.dmp

Filesize
64KB

Download
memory/2900-134-0x00007FFA92C10000-0x00007FFA92C20000-memory.dmp

Filesize
64KB

Download
memory/2900-135-0x00007FFA903C0000-0x00007FFA903D0000-memory.dmp

Filesize
64KB

Download
memory/2900-136-0x00007FFA903C0000-0x00007FFA903D0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads