pysilon | 5888b095ec1f401edce920d33a37cfd0bd0c8443ce688482c2cbaa4679a65bac

Resubmissions

20-06-2024 01:19

240620-bprzba1blf 10

26-05-2024 08:27

240526-kclffacd3v 10

Analysis

max time kernel
15s
max time network
16s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
20-06-2024 01:19

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General

Target

source_prepared.pyc
Size

185KB
MD5

60204318ffa2f037879356afb4b03881
SHA1

f64af513c6fb98d060dad38995fa210ae1d5a5f5
SHA256

94ad449f7a7b065e6ce3a45dff4a47bb3b97ff4e7951b82319e792b5555b1aee
SHA512

c04a8a4b6dcff1c740f04d34fabb552084c5426eb8438ffc271a2725e7f84d5fcffcde23ebd1e6e4a78c4851e73e458a2a3d3960c053d61f4efd982981af68f8
SSDEEP

3072:wTAkLaiI6A9MmlbJo2PEtelZN+tVZa/zqge6/qcCkn0:wTvWiILHJo28cN+7Za/zqgeqPCh

Score

10^/10

pysilon rat stealer

Malware Config

Signatures

Detect Pysilon 1 IoCs

resource	yara_rule
behavioral1/files/0x000900000001ac4a-51.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 5 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\~Mhz	firefox.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	firefox.exe

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1687926120-3022217735-1146543763-1000_Classes\Local Settings	cmd.exe
Key created	\REGISTRY\USER\S-1-5-21-1687926120-3022217735-1146543763-1000_Classes\Local Settings	OpenWith.exe
Key created	\REGISTRY\USER\S-1-5-21-1687926120-3022217735-1146543763-1000_Classes\Local Settings	firefox.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
792	OpenWith.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4216	firefox.exe
Token: SeDebugPrivilege	4216	firefox.exe
Token: SeDebugPrivilege	4216	firefox.exe

Suspicious use of FindShellTrayWindow 4 IoCs

pid	Process
4216	firefox.exe
4216	firefox.exe
4216	firefox.exe
4216	firefox.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
4216	firefox.exe
4216	firefox.exe
4216	firefox.exe

Suspicious use of SetWindowsHookEx 21 IoCs

pid	Process
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
792	OpenWith.exe
4216	firefox.exe
4216	firefox.exe
4216	firefox.exe
4216	firefox.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 792 wrote to memory of 4328	792	OpenWith.exe	74
PID 792 wrote to memory of 4328	792	OpenWith.exe	74
PID 4328 wrote to memory of 4216	4328	firefox.exe	76
PID 4328 wrote to memory of 4216	4328	firefox.exe	76
PID 4328 wrote to memory of 4216	4328	firefox.exe	76
PID 4328 wrote to memory of 4216	4328	firefox.exe	76
PID 4328 wrote to memory of 4216	4328	firefox.exe	76
PID 4328 wrote to memory of 4216	4328	firefox.exe	76
PID 4328 wrote to memory of 4216	4328	firefox.exe	76
PID 4328 wrote to memory of 4216	4328	firefox.exe	76
PID 4328 wrote to memory of 4216	4328	firefox.exe	76
PID 4328 wrote to memory of 4216	4328	firefox.exe	76
PID 4328 wrote to memory of 4216	4328	firefox.exe	76
PID 4216 wrote to memory of 972	4216	firefox.exe	77
PID 4216 wrote to memory of 972	4216	firefox.exe	77
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 840	4216	firefox.exe	78
PID 4216 wrote to memory of 5028	4216	firefox.exe	79

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:5036

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:792
- 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:4328
- - 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:4216
  - - C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="4216.0.1454151957\70564657" -parentBuildID 20221007134813 -prefsHandle 1728 -prefMapHandle 1720 -prefsLen 20747 -prefMapSize 233444 -appDir "C:\Program Files\Mozilla Firefox\browser" - {ebb60a28-0448-4219-9647-745ebbe286c4} 4216 "\\.\pipe\gecko-crash-server-pipe.4216" 1812 26b105d8058 gpu
      4⤵
      PID:972
  - - C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="4216.1.103419030\1478478308" -parentBuildID 20221007134813 -prefsHandle 2176 -prefMapHandle 2172 -prefsLen 21608 -prefMapSize 233444 -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - {7d1d7b84-8f79-454b-9480-8fcfa00eeb9b} 4216 "\\.\pipe\gecko-crash-server-pipe.4216" 2188 26b05572858 socket
      4⤵
      PID:840
  - - C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="4216.2.1861963538\1454279137" -childID 1 -isForBrowser -prefsHandle 2840 -prefMapHandle 2940 -prefsLen 21711 -prefMapSize 233444 -jsInitHandle 1324 -jsInitLen 246848 -a11yResourceId 64 -parentBuildID 20221007134813 -appDir "C:\Program Files\Mozilla Firefox\browser" - {df84b660-5d77-4dd1-9988-30c614a5875f} 4216 "\\.\pipe\gecko-crash-server-pipe.4216" 2744 26b145cce58 tab
      4⤵
      PID:5028
  - - C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="4216.3.231819983\1193935614" -childID 2 -isForBrowser -prefsHandle 3476 -prefMapHandle 3472 -prefsLen 26109 -prefMapSize 233444 -jsInitHandle 1324 -jsInitLen 246848 -a11yResourceId 64 -parentBuildID 20221007134813 -appDir "C:\Program Files\Mozilla Firefox\browser" - {58c46a95-2e41-4db9-9a6e-30af3ceee4df} 4216 "\\.\pipe\gecko-crash-server-pipe.4216" 3488 26b0555b558 tab
      4⤵
      PID:2284
  - - C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="4216.4.1079523129\767342322" -childID 3 -isForBrowser -prefsHandle 4888 -prefMapHandle 4804 -prefsLen 26343 -prefMapSize 233444 -jsInitHandle 1324 -jsInitLen 246848 -a11yResourceId 64 -parentBuildID 20221007134813 -appDir "C:\Program Files\Mozilla Firefox\browser" - {8f7aea62-8a57-489a-85aa-ff0941053a20} 4216 "\\.\pipe\gecko-crash-server-pipe.4216" 4900 26b170bcd58 tab
      4⤵
      PID:3936
  - - C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="4216.5.1275371048\1481571705" -childID 4 -isForBrowser -prefsHandle 5036 -prefMapHandle 5040 -prefsLen 26343 -prefMapSize 233444 -jsInitHandle 1324 -jsInitLen 246848 -a11yResourceId 64 -parentBuildID 20221007134813 -appDir "C:\Program Files\Mozilla Firefox\browser" - {09a5b7a1-721c-488f-97d0-8ced8cdc357a} 4216 "\\.\pipe\gecko-crash-server-pipe.4216" 5028 26b18c32558 tab
      4⤵
      PID:2180
  - - C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="4216.6.1881361636\1440168924" -childID 5 -isForBrowser -prefsHandle 5236 -prefMapHandle 5240 -prefsLen 26343 -prefMapSize 233444 -jsInitHandle 1324 -jsInitLen 246848 -a11yResourceId 64 -parentBuildID 20221007134813 -appDir "C:\Program Files\Mozilla Firefox\browser" - {ca35d925-1363-4275-84f6-3231e6e02bae} 4216 "\\.\pipe\gecko-crash-server-pipe.4216" 5228 26b18c2f258 tab
      4⤵
      PID:4076

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\AppData\Roaming\Mozilla\Firefox\Profiles\6lk2b5bo.default-release\datareporting\glean\db\data.safe.bin

Filesize
9KB

MD5
d58f27a05ea2816635754d6159d86d5e

SHA1
a11d9435812dda38dc79b4e840f164b57458e3ca

SHA256
0463936edb3fad74a0b7a9a40bfb41fae7a422f48c6af771808402526c0be4dd

SHA512
f4b65e5589aa9b69baaaa56e1683c9b9b9362d9bc2dbc1315a77fdc561e0aba8c80701e0f6d8b6533d6cc96128d660bc962cd4eb40e061793d328e39a2e41354

Download Submit
C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\6lk2b5bo.default-release\datareporting\glean\pending_pings\8013da98-ba63-442f-b232-a160eb49b166

Filesize
734B

MD5
f6542cb85cbd0708c6f0d3fd8c1d5e60

SHA1
2182ab5815ab6d924064d822a5d5b786fb1a6e37

SHA256
7f112811108b20f262bd55c1958d865410599df52ac9893b6beda3b2f1772486

SHA512
2385e65270c81e648d7059dfad861c303cc1a55cfd51771f018e0396b50af7d21dd7f9504813d50296229ddfc7c09e6e14ddc9273f59382b3c9ba398c5f20179

Download Submit
C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\6lk2b5bo.default-release\prefs-1.js

Filesize
6KB

MD5
b2f38e3e52ab93231a0c62a3e3a72a3b

SHA1
053dcb66801a61db347ab6434de540d817310f8d

SHA256
8e97688ff33e05223982a4e559ab699eacd90f2de8cedcc9f912a2f77b0b2f72

SHA512
7bd5c2bf81d3a66a19f0642c8d2293a99ceeee5a141157f49e81051f5d1a2326ec5a50d08b31f648552a89637f06f2817fec5e3c0c398c9646927f74e3616544

Download Submit
C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\6lk2b5bo.default-release\prefs.js

Filesize
6KB

MD5
a80072095096a4739e31e2b412dfc735

SHA1
9d169f6510ab5be445552b34d72cffd34480fd93

SHA256
0d8604a52bb90c41c1f6461837f1de527500f88897102c38676da94c78a5005d

SHA512
404a9effaf66221af3ff4762c0514a5aa1bee4be93ab51797f98edeb6f17c56086c2ba2632a1b9a29c891f41e45fec277a31813436e79f3bac802ca941445a6a

Download Submit
C:\Users\Admin\Downloads\qOjGee_6.pyc.part

Filesize
185KB

MD5
60204318ffa2f037879356afb4b03881

SHA1
f64af513c6fb98d060dad38995fa210ae1d5a5f5

SHA256
94ad449f7a7b065e6ce3a45dff4a47bb3b97ff4e7951b82319e792b5555b1aee

SHA512
c04a8a4b6dcff1c740f04d34fabb552084c5426eb8438ffc271a2725e7f84d5fcffcde23ebd1e6e4a78c4851e73e458a2a3d3960c053d61f4efd982981af68f8

Download Submit