ratonrat | 5760552963c066ee4c433ab2d8468286afb83f082ed44bcc81e4d8d70f13ff7f

General

Target
LynxFyxPayload.exe
Size 594KB
Sample260805-sd947avvft
SHA256 5760552963c066ee4c433ab2d8468286afb83f082ed44bcc81e4d8d70f13ff7f
MD5 366861670ec7a2cd0ecff16d9208075e
SHA1 e9e4ec447f4738293a6cb75506d0aaf61f0d5332
SHA512 017e4cf3803f66e92e0bc43bbfbeca66738a5df86988d9c3f7723db7f64fa80d9b8b68a79bff0e09122ed3a886e7e7558e29287a66a4bec360ef4cbdfe870a10
SSDEEP 12288:3Y1R3374rIkzE7tnXknXQaBFJi4RkTAJ0MK86WoLb66OPfD9piIlBk:gL4kkA7lXkXDDuAOFhWSApip
TLSH
T1EBD40204B7FC3616FBFE8B3E59F091480EB2B2538A20D25C5D83D4A91675B429D24FA7
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

costura defense_evasion execution ratonrat packer persistence stealer

Malware Config

Extracted

Family

ratonrat

Version

Free

C2

196.115.30.47:8080

Mutex

oIJvCFDwksR1PyKD6JJrwn3

Attributes

assist
false
box
true
box_icon
Error
box_msg
LynxFyx is missing DLL files AuditEdit.dll, OriginEscalate.dll and couldn't Load Properly
box_title
LynxFyx Has encountered a fatal error and exited
defender
true
delay
0
hide_file
true
open_website
false
process_critical
true
raw
silly21
reconnect
3
startup
true
tag
Infected
uac
false
vm
true
website
https://t.me/sillyisafed

Signatures

Family: RatonRAT
RatonRAT is an information stealer written in C#.
stealer ratonrat

Detects RatonRAT payload 2 IoCs

resource	yara_rule
behavioral1/memory/4504-0-0x000002371E5D0000-0x000002371E66A000-memory.dmp	family_ratonrat
behavioral1/files/0x00080000000245eb-10.dat	family_ratonrat

Executes dropped EXE 2 IoCs

pid	Process
2596	LynxFyxPayload.exe
4716	LynxFyxPayload.exe

Costura .NET executable packer 1 IoCs

Costura packer aka Costura Fody, is an add-in for the .NET framework that embeds all external dependency .dll files as resources inside main executable.

costura packer

resource	yara_rule
behavioral1/files/0x00080000000245eb-10.dat	costura

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4400	cmd.exe

Delays execution with timeout.exe 2 IoCs

defense_evasion

pid	Process
2100	timeout.exe
5116	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
4820	schtasks.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2596	LynxFyxPayload.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4504 wrote to memory of 4400	4504	LynxFyxPayload.exe	85
PID 4400 wrote to memory of 3904	4400	cmd.exe	87
PID 4400 wrote to memory of 5116	4400	cmd.exe	88
PID 4400 wrote to memory of 2596	4400	cmd.exe	90
PID 4400 wrote to memory of 2100	4400	cmd.exe	91
PID 2596 wrote to memory of 4820	2596	LynxFyxPayload.exe	97

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:\Users\Admin\AppData\Local\Temp\LynxFyxPayload.exe
"C:\Users\Admin\AppData\Local\Temp\LynxFyxPayload.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4504
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\Temp\cleanup_p0DGx9PA0xDNd8EwSQ8qwDOFMRWHR8.bat""
  2⤵
  - Executes a command shell one-liner
  - Suspicious use of WriteProcessMemory
  PID:4400
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:3904
- - C:\Windows\system32\timeout.exe
    timeout /t 2 /nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:5116
- - C:\Users\Admin\AppData\Roaming\PlatformRuntime\LynxFyxPayload.exe
    "C:\Users\Admin\AppData\Roaming\PlatformRuntime\LynxFyxPayload.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2596
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "LynxFyxPayload" /sc ONLOGON /tr "\"C:\Users\Admin\AppData\Roaming\PlatformRuntime\LynxFyxPayload.exe\"" /rl HIGHEST /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4820
- - C:\Windows\system32\timeout.exe
    timeout /t 1 /nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:2100

C:\Users\Admin\AppData\Roaming\PlatformRuntime\LynxFyxPayload.exe
"C:\Users\Admin\AppData\Roaming\PlatformRuntime\LynxFyxPayload.exe"
1⤵
- Executes dropped EXE
PID:4716

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

LynxFyxPayload.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\LynxFyxPayload.exe.log
Size 859B
SHA256 685f70bf685f654651dcd0acc495b6f52f02f73cc3ca8b3d2c8433aac9ba144d
MD5 e204f3d12abd1691ce1f149399441188
SHA1 798042095539abfe857e456fca4e1035f67d29bf
SHA512 804c5ea57a59f86fd0c34479be4c479230bff79093548e8461758829928969da565c211ccc9cb9befa0fef15f0400a5b1f17d5ddf88aef6ff01b67a191176b9f
TLSH
T1E7116B70227AA1D889162F952C1E2BC403BF4336B650DE0C7998729EED364175F212E7
MD5 SHA1 SHA512 TLSH

Submit Download

LynxFyxPayload.exe

Path C:\Users\Admin\AppData\Roaming\PlatformRuntime\LynxFyxPayload.exe
Size 594KB
SHA256 5760552963c066ee4c433ab2d8468286afb83f082ed44bcc81e4d8d70f13ff7f
MD5 366861670ec7a2cd0ecff16d9208075e
SHA1 e9e4ec447f4738293a6cb75506d0aaf61f0d5332
SHA512 017e4cf3803f66e92e0bc43bbfbeca66738a5df86988d9c3f7723db7f64fa80d9b8b68a79bff0e09122ed3a886e7e7558e29287a66a4bec360ef4cbdfe870a10
SSDEEP 12288:3Y1R3374rIkzE7tnXknXQaBFJi4RkTAJ0MK86WoLb66OPfD9piIlBk:gL4kkA7lXkXDDuAOFhWSApip
TLSH
T1EBD40204B7FC3616FBFE8B3E59F091480EB2B2538A20D25C5D83D4A91675B429D24FA7
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

cleanup_p0DGx9PA0xDNd8EwSQ8qwDOFMRWHR8.bat

Path C:\Users\Admin\AppData\Roaming\Temp\cleanup_p0DGx9PA0xDNd8EwSQ8qwDOFMRWHR8.bat
Size 558B
SHA256 772328121d0ab29341749ecafc43a136cebc52c75182cad6d2ff1f80f8b02a01
MD5 ab67473842a516586120a8212d278bd9
SHA1 b0f59dacbe948c72b749a6ed7335488edce9957a
SHA512 73b8222023f3e7cbcbe500be32e67a4396e71b7b1645fd2c0a4e7171a7f43a25909ad45b324be71f1432da100bed09de74ff1924ff6a5c66e78d8e06a3ed3eb0
TLSH
T18DF0F612628E832D282464BB0EB7B08ED0E5489B7F8476153BA4C54A87D641BB6D77D2
MD5 SHA1 SHA512 TLSH

Submit Download

memory/2596-13-0x000001FA0CC90000-0x000001FA0CCA0000-memory.dmp

Download

memory/2596-15-0x000001FA0CC90000-0x000001FA0CCA0000-memory.dmp

Download

memory/4504-0-0x000002371E5D0000-0x000002371E66A000-memory.dmp

Download

memory/4504-1-0x000002371EB00000-0x000002371EB10000-memory.dmp

Download

memory/4504-2-0x000002371EA20000-0x000002371EA2A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads