ostap | b479533a51ba629bd5f20a7e9faa3bcccfddc72218b23dfd5a4ab15825204944

Analysis

max time kernel
11s
max time network
111s
platform
windows10_x64
resource
win10v20201028
submitted
09-11-2020 19:58

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General

Target

good.exe
Size

117KB
MD5

3656d2dfcd4f9ebf97e03fa2c9a05ade
SHA1

bd9ecbe901ff4366c789fa63eaffdda9d3f4e931
SHA256

b479533a51ba629bd5f20a7e9faa3bcccfddc72218b23dfd5a4ab15825204944
SHA512

2eb3f78eb1e6dd34563c78a5bd656813a4e80f49676a9fec5ab33290b9fa487d8817ff5cf8c3241031fadf0a010c8a0bf3c9afa5dda9e5c519838a3089350738

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

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\config.jse	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

Processes:

good.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce	good.exe
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\\\""	good.exe

JavaScript code in executable 1 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\config.jse	js

Modifies registry class 1 IoCs

Processes:

cmd.exe

description ioc process

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

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

Processes:

good.execmd.exe

description	pid	process	target process
PID 2604 wrote to memory of 3204	2604	good.exe	cmd.exe
PID 2604 wrote to memory of 3204	2604	good.exe	cmd.exe
PID 2604 wrote to memory of 3204	2604	good.exe	cmd.exe
PID 3204 wrote to memory of 4056	3204	cmd.exe	WScript.exe
PID 3204 wrote to memory of 4056	3204	cmd.exe	WScript.exe
PID 3204 wrote to memory of 4056	3204	cmd.exe	WScript.exe

C:\Users\Admin\AppData\Local\Temp\good.exe
"C:\Users\Admin\AppData\Local\Temp\good.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:2604

C:\Windows\SysWOW64\cmd.exe
cmd /c title ok && config.jse && type dr.txt && exit
2⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3204

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\config.jse"
3⤵
PID:4056

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\config.jse

MD5
d63bd77881ceee2103ccbc14b7131373

SHA1
9844d5abf8c62726c1b170dde01c5191dc1b1fed

SHA256
4dcb462e75b20c85773ecb9767ac784e189868fd6cd081a273b1c0d8b24bf63a

SHA512
bc457499deb781c01515b165939666f86eaa060e574ac352186217779676dd2a8f5c247e6607b49eff170bafe13e3cb00da62e73e43ce8c112711d72b98128e2

Download Submit
memory/3204-0-0x0000000000000000-mapping.dmp

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memory/4056-2-0x0000000000000000-mapping.dmp

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