ostap | ea05817e0614fd085e2775d01e7197e93bde58cf57789aeb49ed39f6c295973c

Analysis

max time kernel
25s
max time network
109s
platform
windows10_x64
resource
win10v20201028
submitted
09-11-2020 20:37

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General

Target

good5.exe
Size

134KB
MD5

5f3450647a951c4c8a262f603ca8aabf
SHA1

0dc1e18dc14a9e6d5dedf644b4d690075e77bbff
SHA256

ea05817e0614fd085e2775d01e7197e93bde58cf57789aeb49ed39f6c295973c
SHA512

8f2eff9a18b27b3bce75f9b7c0c0b3d947344c7acd71e54ee398ca15b089f1000dbb1643ad2c8d0d21dccf5dc54fd4af7c15e3a4cafa150dd8e13bcb5a8e04e0

Score

10^/10

ostap downloader persistence

Malware Config

Signatures

Ostap JavaScript Downloader 1 IoCs

Ostap is a JavaScript downloader that's been active since 2016. It's used to deliver several families, inluding TrickBot

resource	yara_rule
behavioral2/files/0x000300000001ab8f-2.dat	family_ostap

ostap
Ostap is a JS downloader, used to deliver other families.
downloader ostap

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\wextract_cleanup0 = "rundll32.exe C:\\Windows\\system32\\advpack.dll,DelNodeRunDLL32 \"C:\\Users\\Admin\\AppData\\Local\\Temp\\IXP000.TMP\\\""	good5.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce	good5.exe

JavaScript code in executable 1 IoCs

resource	yara_rule
behavioral2/files/0x000300000001ab8f-2.dat	js

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000_Classes\Local Settings	cmd.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 412 wrote to memory of 3212	412	good5.exe	75
PID 412 wrote to memory of 3212	412	good5.exe	75
PID 412 wrote to memory of 3212	412	good5.exe	75
PID 3212 wrote to memory of 3016	3212	cmd.exe	80
PID 3212 wrote to memory of 3016	3212	cmd.exe	80
PID 3212 wrote to memory of 3016	3212	cmd.exe	80

C:\Users\Admin\AppData\Local\Temp\good5.exe
"C:\Users\Admin\AppData\Local\Temp\good5.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:412
- C:\Windows\SysWOW64\cmd.exe
  cmd /c type xi.bmp & magnium.jse & set
  2⤵
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:3212
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\magnium.jse"
    3⤵
    PID:3016

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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