841a98464457d2fceff8a35e6b575b1e5e0681f7232cb3c2b94c698e38960a25

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25-03-2024 21:05

240325-zxdnnahe48 3

25-03-2024 20:59

25-03-2024 20:56

25-03-2024 20:51

25-03-2024 20:45

25-03-2024 20:38

25-03-2024 20:36

Analysis

max time kernel
122s
max time network
128s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
25-03-2024 20:38

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General

Target

Prefetch/BACKGROUNDTASKHOST.EXE-1195A7D1.pf
Size

13KB
MD5

e297e82a93124283c72258f4e344752e
SHA1

76bf69f907c133eb8d5abda63380e47771aa6c53
SHA256

ab0cbfdd9846a8a4597175a4c6b143f80b0847967b48c08b708e5cfc3678f755
SHA512

96254cb23a1aac6e783870e34611223da32ef002e31464f023e94fe1a55eb099bb3101612505a03967700a8a5779febdffe2ca5cc70c43454746a04a8e19628d
SSDEEP

384:lKKZ54ecx0p7sP/B/KUzvAp9G9fATj9+Bvf1U:lKKZZHsP/B/KUBIVQi

Score

3^/10

Malware Config

Signatures

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Modifies registry class 9 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3787592910-3720486031-2929222812-1000_CLASSES\pf_auto_file\shell	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3787592910-3720486031-2929222812-1000_Classes\Local Settings	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3787592910-3720486031-2929222812-1000_CLASSES\pf_auto_file	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3787592910-3720486031-2929222812-1000_CLASSES\.pf	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3787592910-3720486031-2929222812-1000_CLASSES\pf_auto_file\shell\Read	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3787592910-3720486031-2929222812-1000_CLASSES\pf_auto_file\	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3787592910-3720486031-2929222812-1000_CLASSES\.pf\ = "pf_auto_file"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-3787592910-3720486031-2929222812-1000_CLASSES\pf_auto_file\shell\Read\command	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3787592910-3720486031-2929222812-1000_CLASSES\pf_auto_file\shell\Read\command\ = "\"C:\\Program Files (x86)\\Adobe\\Reader 9.0\\Reader\\AcroRd32.exe\" \"%1\""	rundll32.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2560	AcroRd32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2560	AcroRd32.exe
2560	AcroRd32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2104 wrote to memory of 2844	2104	cmd.exe	29
PID 2104 wrote to memory of 2844	2104	cmd.exe	29
PID 2104 wrote to memory of 2844	2104	cmd.exe	29
PID 2844 wrote to memory of 2560	2844	rundll32.exe	30
PID 2844 wrote to memory of 2560	2844	rundll32.exe	30
PID 2844 wrote to memory of 2560	2844	rundll32.exe	30
PID 2844 wrote to memory of 2560	2844	rundll32.exe	30

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\Prefetch\BACKGROUNDTASKHOST.EXE-1195A7D1.pf
1⤵
- Suspicious use of WriteProcessMemory
PID:2104
- C:\Windows\system32\rundll32.exe
  "C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\Prefetch\BACKGROUNDTASKHOST.EXE-1195A7D1.pf
  2⤵
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2844
- - 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\Prefetch\BACKGROUNDTASKHOST.EXE-1195A7D1.pf"
    3⤵
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    PID:2560

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Adobe\Acrobat\9.0\SharedDataEvents

Filesize
3KB

MD5
b11735a60b61a2bc4419cf329898bb4f

SHA1
879c0b79ccd3e9c3a938c7bd15cb63ea879e805f

SHA256
63b4cc5b9c0a247fd37c7b0a95aa326b38a8bb6ff07e9388fb46c43183e35092

SHA512
5078f39cbad4241088b75b852130557ab7e15074a8bb2e0cc21cdd01442c01f7ad1ab715930ffb5d16f2348fce01834863223829dda675de7e44e2b1887234e9

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