pysilon | aa2bc6bdab3c1cd9cc94e92a00f2501ffd6bef384e69e605b9533ee4a9af2fcc

Resubmissions

25-12-2024 11:40

241225-ns1f3ssmct 10

20-06-2024 01:12

240620-bk1qnavdrk 10

01-06-2024 22:28

240601-2d43lsgh7s 10

Analysis

max time kernel
13s
max time network
15s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
20-06-2024 01:12

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General

Target

source_prepared.pyc
Size

65KB
MD5

845ddc446661a59b101ca716985e834c
SHA1

0e2710e3a29d83ba378f8e63546ef26ef6ad02a9
SHA256

a99b29abc5cebb9e2efadb3aee5fc573a205503a67ecf8b71f580e61813202c8
SHA512

a76f86ba39bb27462b89f92582a1b4d735f88f2b3dede8787781326287fc77e0ce0b0aac0246324ed9f0898e9de998104d28b161a8a8d02c6f59f65667e644a6
SSDEEP

768:IaGFa0lgVgaA6RRaAZJjLwBjIgevrBYCFjUBJ29EW4VHjrlbedBDoeUgLiLmC/5q:IawgVguasyBj1uYCFjUTH/IdBDoTLBxq

Score

10^/10

pysilon rat stealer

Malware Config

Signatures

Detect Pysilon 1 IoCs

resource	yara_rule
behavioral1/files/0x00090000000233bf-14.dat	pysilon

PySilon
An open-source RAT written in Python.
stealer rat pysilon
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 6 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	firefox.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Update Signature	firefox.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Update Revision	firefox.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	firefox.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~Mhz	firefox.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	firefox.exe

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000_Classes\Local Settings	cmd.exe
Key created	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000_Classes\Local Settings	firefox.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4260	OpenWith.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3404	firefox.exe
Token: SeDebugPrivilege	3404	firefox.exe
Token: SeDebugPrivilege	3404	firefox.exe

Suspicious use of FindShellTrayWindow 4 IoCs

pid	Process
3404	firefox.exe
3404	firefox.exe
3404	firefox.exe
3404	firefox.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
3404	firefox.exe
3404	firefox.exe
3404	firefox.exe

Suspicious use of SetWindowsHookEx 21 IoCs

pid	Process
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
4260	OpenWith.exe
3404	firefox.exe
3404	firefox.exe
3404	firefox.exe
3404	firefox.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 4260 wrote to memory of 4000	4260	OpenWith.exe	83
PID 4260 wrote to memory of 4000	4260	OpenWith.exe	83
PID 4000 wrote to memory of 3404	4000	firefox.exe	85
PID 4000 wrote to memory of 3404	4000	firefox.exe	85
PID 4000 wrote to memory of 3404	4000	firefox.exe	85
PID 4000 wrote to memory of 3404	4000	firefox.exe	85
PID 4000 wrote to memory of 3404	4000	firefox.exe	85
PID 4000 wrote to memory of 3404	4000	firefox.exe	85
PID 4000 wrote to memory of 3404	4000	firefox.exe	85
PID 4000 wrote to memory of 3404	4000	firefox.exe	85
PID 4000 wrote to memory of 3404	4000	firefox.exe	85
PID 4000 wrote to memory of 3404	4000	firefox.exe	85
PID 4000 wrote to memory of 3404	4000	firefox.exe	85
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 552	3404	firefox.exe	86
PID 3404 wrote to memory of 3248	3404	firefox.exe	87
PID 3404 wrote to memory of 3248	3404	firefox.exe	87
PID 3404 wrote to memory of 3248	3404	firefox.exe	87
PID 3404 wrote to memory of 3248	3404	firefox.exe	87
PID 3404 wrote to memory of 3248	3404	firefox.exe	87
PID 3404 wrote to memory of 3248	3404	firefox.exe	87
PID 3404 wrote to memory of 3248	3404	firefox.exe	87
PID 3404 wrote to memory of 3248	3404	firefox.exe	87

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\source_prepared.pyc
1⤵
- Modifies registry class
PID:4544

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4260
- C:\Program Files\Mozilla Firefox\firefox.exe
  "C:\Program Files\Mozilla Firefox\firefox.exe" -osint -url "C:\Users\Admin\AppData\Local\Temp\source_prepared.pyc"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4000
- - C:\Program Files\Mozilla Firefox\firefox.exe
    "C:\Program Files\Mozilla Firefox\firefox.exe" -osint -url C:\Users\Admin\AppData\Local\Temp\source_prepared.pyc
    3⤵
    - Checks processor information in registry
    - Modifies registry class
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3404
  - - C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="3404.0.1506565486\409303122" -parentBuildID 20230214051806 -prefsHandle 1740 -prefMapHandle 1732 -prefsLen 22076 -prefMapSize 235121 -appDir "C:\Program Files\Mozilla Firefox\browser" - {c21d8c13-390e-473b-9d88-9d0954009674} 3404 "\\.\pipe\gecko-crash-server-pipe.3404" 1820 1d6d810d158 gpu
      4⤵
      PID:552
  - - C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="3404.1.863301914\1671503650" -parentBuildID 20230214051806 -prefsHandle 2384 -prefMapHandle 2380 -prefsLen 22927 -prefMapSize 235121 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {bd950c07-c678-4f2f-bc51-73def17169ba} 3404 "\\.\pipe\gecko-crash-server-pipe.3404" 2408 1d6cb489c58 socket
      4⤵
      PID:3248
  - - C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="3404.2.67828325\76141035" -childID 1 -isForBrowser -prefsHandle 2940 -prefMapHandle 2852 -prefsLen 23030 -prefMapSize 235121 -jsInitHandle 1284 -jsInitLen 246560 -a11yResourceId 64 -parentBuildID 20230214051806 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {c2c56920-f0f1-4981-a5a5-c8f058ecb63b} 3404 "\\.\pipe\gecko-crash-server-pipe.3404" 2928 1d6db150858 tab
      4⤵
      PID:3808
  - - C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="3404.3.1827147503\1627434712" -childID 2 -isForBrowser -prefsHandle 3564 -prefMapHandle 3560 -prefsLen 27616 -prefMapSize 235121 -jsInitHandle 1284 -jsInitLen 246560 -a11yResourceId 64 -parentBuildID 20230214051806 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {7a871a3c-1fbb-443f-b3b0-43ec53f96424} 3404 "\\.\pipe\gecko-crash-server-pipe.3404" 3576 1d6dc6b9b58 tab
      4⤵
      PID:4716
  - - C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="3404.4.1832427482\54351916" -childID 3 -isForBrowser -prefsHandle 5188 -prefMapHandle 5184 -prefsLen 27692 -prefMapSize 235121 -jsInitHandle 1284 -jsInitLen 246560 -a11yResourceId 64 -parentBuildID 20230214051806 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {500845e8-1471-43ee-b029-2dbf0fd82983} 3404 "\\.\pipe\gecko-crash-server-pipe.3404" 5196 1d6debe1e58 tab
      4⤵
      PID:2556
  - - C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="3404.5.1073146224\1259311418" -childID 4 -isForBrowser -prefsHandle 5408 -prefMapHandle 5404 -prefsLen 27692 -prefMapSize 235121 -jsInitHandle 1284 -jsInitLen 246560 -a11yResourceId 64 -parentBuildID 20230214051806 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {beb622f9-a765-47b1-8e21-6136b5d78878} 3404 "\\.\pipe\gecko-crash-server-pipe.3404" 5416 1d6dec1a558 tab
      4⤵
      PID:3724
  - - C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="3404.6.753474130\1500263407" -childID 5 -isForBrowser -prefsHandle 5552 -prefMapHandle 5556 -prefsLen 27692 -prefMapSize 235121 -jsInitHandle 1284 -jsInitLen 246560 -a11yResourceId 64 -parentBuildID 20230214051806 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {e25c190e-d614-4355-bdd6-51a7e6501944} 3404 "\\.\pipe\gecko-crash-server-pipe.3404" 5544 1d6dec1cf58 tab
      4⤵
      PID:2576

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\Downloads\ADT7XKpM.pyc.part

Filesize
65KB

MD5
845ddc446661a59b101ca716985e834c

SHA1
0e2710e3a29d83ba378f8e63546ef26ef6ad02a9

SHA256
a99b29abc5cebb9e2efadb3aee5fc573a205503a67ecf8b71f580e61813202c8

SHA512
a76f86ba39bb27462b89f92582a1b4d735f88f2b3dede8787781326287fc77e0ce0b0aac0246324ed9f0898e9de998104d28b161a8a8d02c6f59f65667e644a6

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