MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 4a440ef3be94895fcaaab5b4ba0755e8350e6131cabd507be510056739601df4. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.
Database Entry
OskiStealer
Vendor detections: 8
| SHA256 hash: | 4a440ef3be94895fcaaab5b4ba0755e8350e6131cabd507be510056739601df4 |
|---|---|
| SHA3-384 hash: | 4c9fc3ea2a21c288ffc901bd6dcaf9d215d8e1f849bbc44ee7f667d3d1b3ecb46c350f87420581b4b3c10d853e357f5e |
| SHA1 hash: | f711f8acd1b587e2edc557756019e367d3ac8c78 |
| MD5 hash: | 74b37b00ec4ea2e2ee861621c5191ac2 |
| humanhash: | avocado-idaho-earth-coffee |
| File name: | 74b37b00ec4ea2e2ee861621c5191ac2.exe |
| Download: | download sample |
| Signature | OskiStealer |
| File size: | 1'346'048 bytes |
| First seen: | 2021-07-21 19:30:52 UTC |
| Last seen: | Never |
| File type: |  exe |
| MIME type: | application/x-dosexec |
| imphash | 4da7a3c908f70c18780a67a792276e49 (2 x OskiStealer) |
| ssdeep | 24576:3XouY9hgpcQ1eCBt8lvT/nfntO6S2bWU+2SJSNoj5TFs:3XoUBty/fnt24Y2ESkM |
| Threatray | 268 similar samples on MalwareBazaar |
| TLSH | T17F5533B7ADCB9A16DDF98A7E66D11AA703320D7D6094205F74A92E30D5EE430834DFB0 |
| Reporter |  abuse_ch |
| Tags: | exe OskiStealer |
Indicators Of Compromise (IOCs)
Below is a list of indicators of compromise (IOCs) associated with this malware samples.
| IOC | ThreatFox Reference |
|---|---|
| http://silverscreen.sg/se//6.jpg | https://threatfox.abuse.ch/ioc/161980/ |
| http://silverscreen.sg/se//1.jpg | https://threatfox.abuse.ch/ioc/161981/ |
| http://silverscreen.sg/se//2.jpg | https://threatfox.abuse.ch/ioc/161982/ |
| http://silverscreen.sg/se//3.jpg | https://threatfox.abuse.ch/ioc/161983/ |
| http://silverscreen.sg/se//4.jpg | https://threatfox.abuse.ch/ioc/161984/ |
| http://silverscreen.sg/se//5.jpg | https://threatfox.abuse.ch/ioc/161985/ |
| http://silverscreen.sg/se//7.jpg | https://threatfox.abuse.ch/ioc/161986/ |
Intelligence
File Origin
# of uploads :
1
# of downloads :
116
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
74b37b00ec4ea2e2ee861621c5191ac2.exe
Verdict:
Malicious activity
Analysis date:
2021-07-21 19:34:30 UTC
Tags:
trojan stealer vidar loader
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Result
Verdict:
MALICIOUS
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Verdict:
Malicious
Result
Threat name:
Oski Vidar
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Signature
Antivirus / Scanner detection for submitted sample
Detected unpacking (changes PE section rights)
Downloads files with wrong headers with respect to MIME Content-Type
Found many strings related to Crypto-Wallets (likely being stolen)
Hides threads from debuggers
Machine Learning detection for sample
Multi AV Scanner detection for submitted file
PE file has nameless sections
Posts data to a JPG file (protocol mismatch)
Tries to detect sandboxes and other dynamic analysis tools (window names)
Tries to evade analysis by execution special instruction which cause usermode exception
Yara detected Oski Stealer
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Threat name:
Win32.Trojan.Generic
Status:
Suspicious
First seen:
2021-07-19 22:23:09 UTC
AV detection:
23 of 28 (82.14%)
Threat level:
5/5
Detection(s):
Suspicious file
Verdict:
suspicious
Similar samples:
+ 258 additional samples on MalwareBazaar
Result
Malware family:
oski
Score:
10/10
Tags:
family:oski discovery infostealer spyware stealer
Behaviour
Checks processor information in registry
Kills process with taskkill
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Suspicious use of NtSetInformationThreadHideFromDebugger
Accesses cryptocurrency files/wallets, possible credential harvesting
Checks installed software on the system
Deletes itself
Loads dropped DLL
Reads user/profile data of web browsers
Downloads MZ/PE file
Oski
Unpacked files
SH256 hash:
4a440ef3be94895fcaaab5b4ba0755e8350e6131cabd507be510056739601df4
MD5 hash:
74b37b00ec4ea2e2ee861621c5191ac2
SHA1 hash:
f711f8acd1b587e2edc557756019e367d3ac8c78
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
YARA Signatures
MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.
| Rule name: | EnigmaStub |
|---|---|
| Author: | @bartblaze |
| Description: | Identifies Enigma packer stub. |
| Rule name: | MALWARE_Win_Vidar |
|---|---|
| Author: | ditekSHen |
| Description: | Detects Vidar / ArkeiStealer |
| Rule name: | SUSP_XORed_URL_in_EXE |
|---|---|
| Author: | Florian Roth |
| Description: | Detects an XORed URL in an executable |
| Reference: | https://twitter.com/stvemillertime/status/1237035794973560834 |
| Rule name: | Vidar |
|---|---|
| Author: | kevoreilly |
| Description: | Vidar Payload |
| Rule name: | win_smominru_auto |
|---|---|
| Author: | Felix Bilstein - yara-signator at cocacoding dot com |
| Description: | Detects win.smominru. |
File information
The table below shows additional information about this malware sample such as delivery method and external references.
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