841a98464457d2fceff8a35e6b575b1e5e0681f7232cb3c2b94c698e38960a25

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25-03-2024 21:05

240325-zxdnnahe48 3

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Analysis

max time kernel
18s
max time network
19s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
25-03-2024 20:51

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General

Target

Prefetch/CSRSS.EXE-F3C368CB.pf
Size

5KB
MD5

7f43a31579363a1bc4ea108a42831a4f
SHA1

9914afdca0372bd65a0854a777108f3f558d8c9c
SHA256

3605b4b1fd767413b74bd08239492fcb007662655a7bc976487c7a62018765c9
SHA512

48bdc35433d55170e7856605851f12b6698c0179fbc9eb809fb53d195b23806b8c5a327d79137fb85c8ca76f964bb7da345a0ddaf7f53318a52a0321c73abbe8
SSDEEP

96:sq+e5b9p4dS/RD7eoZAoYG7X3CNvJ0SRAAXbib8sv9xkFvQDDRReBJ9rJeB:sq+e5b9t/RvHZAVG7X3Cn0+vLHsbTDRR

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-1-5-21-778096762-2241304387-192235952-1000_CLASSES\pf_auto_file	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000_CLASSES\pf_auto_file\	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000_CLASSES\pf_auto_file\shell\Read\command	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000_Classes\Local Settings	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000_CLASSES\.pf	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000_CLASSES\.pf\ = "pf_auto_file"	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000_CLASSES\pf_auto_file\shell\Read	rundll32.exe
Key created	\REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000_CLASSES\pf_auto_file\shell	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000_CLASSES\pf_auto_file\shell\Read\command\ = "\"C:\\Program Files (x86)\\Adobe\\Reader 9.0\\Reader\\AcroRd32.exe\" \"%1\""	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2128	AcroRd32.exe
2128	AcroRd32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2216 wrote to memory of 2584	2216	cmd.exe	29
PID 2216 wrote to memory of 2584	2216	cmd.exe	29
PID 2216 wrote to memory of 2584	2216	cmd.exe	29
PID 2584 wrote to memory of 2128	2584	rundll32.exe	30
PID 2584 wrote to memory of 2128	2584	rundll32.exe	30
PID 2584 wrote to memory of 2128	2584	rundll32.exe	30
PID 2584 wrote to memory of 2128	2584	rundll32.exe	30

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\Prefetch\CSRSS.EXE-F3C368CB.pf
1⤵
- Suspicious use of WriteProcessMemory
PID:2216
- C:\Windows\system32\rundll32.exe
  "C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\Prefetch\CSRSS.EXE-F3C368CB.pf
  2⤵
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2584
- - 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\CSRSS.EXE-F3C368CB.pf"
    3⤵
    - Suspicious use of SetWindowsHookEx
    PID:2128

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
9cc9009592a8b638de0520d0db28fda3

SHA1
11e0b209f09968b40b231ce2c60c4d58310c2bcf

SHA256
6373bab2bc57a3c4466c174786598b5310c366add91ddaa9a06a12194997897a

SHA512
7892897e3dfc7946804465e0d9939a360e6a9abbd9c545291a4321075b220f9e50241b88602c611d906ce80cba5af550140d3bca7a42e1d842ab8a7e18ac8573

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