MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 55f1a2084fd1c1d5477519f06b02aa4fa4d917aaceffd116fc45820dc49a7795. 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: 7


Intelligence 7 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 55f1a2084fd1c1d5477519f06b02aa4fa4d917aaceffd116fc45820dc49a7795
SHA3-384 hash: 1db3c7658e1d352b0c7884b6cea2d252c8fc002dd775bf4bea4521d7ba18cd617dcc81c2483e515dfbaf22a9b5b4c9ef
SHA1 hash: 1906b349086ad6df1f7e7c040953dcd8665d0806
MD5 hash: 888890bc8c11a666a615936dcbe22d23
humanhash: mars-grey-early-mike
File name:P I No.42037.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:417'280 bytes
First seen:2021-04-22 06:53:30 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'652 x AgentTesla, 19'463 x Formbook, 12'204 x SnakeKeylogger)
ssdeep 6144:P/EzJrRLmQtfUeAIQHuA36cdFP1dREiKTYNKnGQNRG:P/AeeAItC66FNdR5EzrA
TLSH 4F94C379FDFF6A85C200CE3AA6AD705603E19D45CE4B832BE4D472A47E31ED81A0654F
Reporter abuse_ch
Tags:exe OskiStealer

Intelligence

File Origin
# of uploads :
1
# of downloads :
119
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
P I No.42037.exe
Verdict:
Suspicious activity
Analysis date:
2021-04-22 03:52:22 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/ba5b0b84-be23-4074-a8da-97809a18b70d

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/143584/
Detection(s):
SecuriteInfo.com.Artemis888890BC8C11.26589.25214.UNOFFICIAL
Create hunting rule

Result
Verdict:
Clean
Maliciousness:

Behaviour
Sending a UDP request
Launching the default Windows debugger (dwwin.exe)
Result
Verdict:
UNKNOWN
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Result
Threat name:
Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/692409
Signature
.NET source code contains potential unpacker
Adds a directory exclusion to Windows Defender
Allocates memory in foreign processes
Creates an undocumented autostart registry key
Downloads files with wrong headers with respect to MIME Content-Type
Found many strings related to Crypto-Wallets (likely being stolen)
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
Machine Learning detection for sample
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Performs DNS queries to domains with low reputation
Posts data to a JPG file (protocol mismatch)
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Crypto Currency Wallets
Writes to foreign memory regions
Wscript starts Powershell (via cmd or directly)
Yara detected Costura Assembly Loader
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 395141 Sample: P I No.42037.exe Startdate: 22/04/2021 Architecture: WINDOWS Score: 100 47 Multi AV Scanner detection for dropped file 2->47 49 Multi AV Scanner detection for submitted file 2->49 51 Yara detected Vidar stealer 2->51 53 9 other signatures 2->53 8 P I No.42037.exe 3 10 2->8         started        process3 file4 29 C:\Users\user\AppData\Roaming\...\notpad.exe, PE32 8->29 dropped 31 C:\Users\user\AppData\...\P I No.42037.exe, PE32 8->31 dropped 33 C:\Users\user\...\notpad.exe:Zone.Identifier, ASCII 8->33 dropped 35 2 other malicious files 8->35 dropped 55 Creates an undocumented autostart registry key 8->55 57 Writes to foreign memory regions 8->57 59 Allocates memory in foreign processes 8->59 61 Injects a PE file into a foreign processes 8->61 12 P I No.42037.exe 193 8->12         started        17 wscript.exe 1 8->17         started        signatures5 process6 dnsIp7 45 osiq.xyz 194.147.142.153, 49736, 80 PTPEU unknown 12->45 37 C:\ProgramData\vcruntime140.dll, PE32 12->37 dropped 39 C:\ProgramData\sqlite3.dll, PE32 12->39 dropped 41 C:\ProgramData\softokn3.dll, PE32 12->41 dropped 43 4 other files (none is malicious) 12->43 dropped 63 Tries to harvest and steal browser information (history, passwords, etc) 12->63 65 Tries to steal Crypto Currency Wallets 12->65 19 cmd.exe 1 12->19         started        67 Wscript starts Powershell (via cmd or directly) 17->67 69 Adds a directory exclusion to Windows Defender 17->69 21 powershell.exe 26 17->21         started        file8 signatures9 process10 process11 23 conhost.exe 19->23         started        25 taskkill.exe 19->25         started        27 conhost.exe 21->27         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/55f1a2084fd1c1d5477519f06b02aa4fa4d917aaceffd116fc45820dc49a7795/
Threat name:
ByteCode-MSIL.Trojan.Pwsx
Create hunting rule
Status:
Malicious
First seen:
2021-04-22 03:17:19 UTC
AV detection:
17 of 47 (36.17%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=kxy2eccp2ha5kr3vdhygwavkj6snsf5kz375cfx4iwba3re2o6kq._file
Result
Malware family:
oski
Create hunting rule
Score:
  10/10
Tags:
family:oski discovery infostealer spyware stealer
Link:
https://tria.ge/reports/210422-2eyrk346nj/
Behaviour
Checks processor information in registry
Kills process with taskkill
Modifies registry class
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Suspicious use of SetThreadContext
Accesses cryptocurrency files/wallets, possible credential harvesting
Checks installed software on the system
Loads dropped DLL
Reads user/profile data of web browsers
Downloads MZ/PE file
Oski
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/55f1a2084fd1c1d5477519f06b02aa4fa4d917aaceffd116fc45820dc49a7795

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:MALWARE_Win_Vidar
Create hunting rule
Author:ditekSHen
Description:Detects Vidar / ArkeiStealer
Rule name:Vidar
Create hunting rule
Author:kevoreilly
Description:Vidar Payload
Rule name:win_oski_auto
Create hunting rule
Author:Felix Bilstein - yara-signator at cocacoding dot com
Description:autogenerated rule brought to you by yara-signator
Rule name:win_oski_g0
Create hunting rule
Author:Slavo Greminger, SWITCH-CERT

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Cape
Cape
https://www.capesandbox.com/analysis/143584/

Comments