MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 66a1b49f893976a60ca25813345ea54a5582acf7a5a0821c03cc45bcfc89b5c5. 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: 12


Intelligence 12 IOCs 7 YARA 6 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 66a1b49f893976a60ca25813345ea54a5582acf7a5a0821c03cc45bcfc89b5c5
SHA3-384 hash: cfab488ba06d5d224941503ab312f6a0f8b4ee8da3c990c707c07ba5ff204a72d4ab318864e47b8325c619c915cecb40
SHA1 hash: d85f4cf7ebf3bc594e303894fae9ae8c920ad4ad
MD5 hash: 1d901aa6dded4bdf5e3dcec4393e53ce
humanhash: mirror-hydrogen-blossom-diet
File name:1d901aa6dded4bdf5e3dcec4393e53ce.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:545'792 bytes
First seen:2021-10-27 16:46:05 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'740 x AgentTesla, 19'600 x Formbook, 12'241 x SnakeKeylogger)
ssdeep 12288:t/cldCJdn9FXY1u+AFobpBJ5Fec0xyMYQ:1edCJd99Y8+A+bTwc
Threatray 4'005 similar samples on MalwareBazaar
TLSH T1A7C4DF41F1688535F928197518E3B251CE6DAD801406CA816BBD3B4F7F772E48F0EAEE
Reporter abuse_ch
Tags:exe OskiStealer


Avatar
abuse_ch
OskiStealer C2:
http://gervenez.xyz/6.jpg

Indicators Of Compromise (IOCs)

Below is a list of indicators of compromise (IOCs) associated with this malware samples.

IOCThreatFox Reference
http://gervenez.xyz/6.jpg https://threatfox.abuse.ch/ioc/238484/
http://gervenez.xyz/1.jpg https://threatfox.abuse.ch/ioc/238485/
http://gervenez.xyz/2.jpg https://threatfox.abuse.ch/ioc/238486/
http://gervenez.xyz/3.jpg https://threatfox.abuse.ch/ioc/238487/
http://gervenez.xyz/4.jpg https://threatfox.abuse.ch/ioc/238488/
http://gervenez.xyz/5.jpg https://threatfox.abuse.ch/ioc/238489/
http://gervenez.xyz/7.jpg https://threatfox.abuse.ch/ioc/238490/

Intelligence

File Origin
# of uploads :
1
# of downloads :
202
Origin country :
n/a
Vendor Threat Intelligence
Detection:
Vidar
Create hunting rule
Link:
https://www.capesandbox.com/analysis/200659/
Detection(s):
SecuriteInfo.com.Artemis1D901AA6DDED.13235.17773.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Launching a process
Creating a file in the %temp% directory
Delayed writing of the file
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
obfuscated packed
Link:
https://www.filescan.io/uploads/617982869a5a1e91c5d7a188/reports/2ea5da8e-602c-4785-8c03-ad2b7aa4c474/overview
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.
Malware family:
Oski Stealer
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/c37b1104-4a90-4c3a-8dcc-c6de3c8b7174
Result
Threat name:
Oski Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/877946
Signature
.NET source code contains potential unpacker
Downloads files with wrong headers with respect to MIME Content-Type
Found malware configuration
Found many strings related to Crypto-Wallets (likely being stolen)
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
Yara detected AntiVM3
Yara detected Oski Stealer
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 510380 Sample: 6TUQ9Lb5rN.exe Startdate: 27/10/2021 Architecture: WINDOWS Score: 100 32 Found malware configuration 2->32 34 Yara detected Oski Stealer 2->34 36 Yara detected AntiVM3 2->36 38 6 other signatures 2->38 8 6TUQ9Lb5rN.exe 3 2->8         started        process3 signatures4 40 Performs DNS queries to domains with low reputation 8->40 11 6TUQ9Lb5rN.exe 196 8->11         started        process5 dnsIp6 30 gervenez.xyz 172.67.190.175, 49744, 80 CLOUDFLARENETUS United States 11->30 22 C:\ProgramData\vcruntime140.dll, PE32 11->22 dropped 24 C:\ProgramData\sqlite3.dll, PE32 11->24 dropped 26 C:\ProgramData\softokn3.dll, PE32 11->26 dropped 28 4 other files (none is malicious) 11->28 dropped 42 Tries to harvest and steal browser information (history, passwords, etc) 11->42 44 Tries to steal Crypto Currency Wallets 11->44 16 cmd.exe 1 11->16         started        file7 signatures8 process9 process10 18 taskkill.exe 1 16->18         started        20 conhost.exe 16->20         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/66a1b49f893976a60ca25813345ea54a5582acf7a5a0821c03cc45bcfc89b5c5/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2021-10-27 16:47:03 UTC
AV detection:
10 of 27 (37.04%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=m2q3jh4jhf3kmdfclajtixvfjjkyflhxuwqiehadzrc3z7ejwxcq._file
Verdict:
malicious
Similar samples:
192f884438809d6fb01ae0c89c4ccd1fdae62d429e78bdbcc4ff4d28a54049af
OskiStealer
4ee9983bc82214479876383c1caa6c1800df1d9d9bc733bf0be74150570b12d0
OskiStealer
652ff7f52f0e2d6bdd5a0f36f4b24c4dafc8aab7d5236db91b77267650cdb140
OskiStealer
b43dde5ca3d23d16af5bf34c522869dff9624a78be67dfc3acde5c81ef24d318
OskiStealer
c17243e46ff224631e589c55642c3666e5c560715841e8b8ebdd511cb70da8dd
OskiStealer
d53af79b3996389ff73ab33578448fd5e6ee2698251451ed3df7c63ba025fd21
OskiStealer
dda5d47308c0ebcb2555cda19b4c05a88d633396909456b9ee5fcee42e197724
OskiStealer
+ 3'995 additional samples on MalwareBazaar
Result
Malware family:
oski
Create hunting rule
Score:
  10/10
Tags:
family:oski discovery infostealer spyware stealer suricata
Link:
https://tria.ge/reports/211027-t91q3ahccr/
Behaviour
Checks processor information in registry
Kills process with taskkill
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
Deletes itself
Loads dropped DLL
Reads user/profile data of web browsers
Downloads MZ/PE file
Oski
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
Malware Config
C2 Extraction:
gervenez.xyz
Unpacked files
SH256 hash:
d316c492526a7742dd211d2f85a5d921c9e79b9dc02b2695ed7fed2d3f9c0e0e
MD5 hash:
6fac005443769d4ebfba134847114aea
SHA1 hash:
edd3dbf226083cda3c9837fa0dd61ee591c9a06f
Detections:
win_oski_g0
Create hunting rule
win_oski_auto
Create hunting rule
Link:
https://www.unpac.me/results/23353819-1edd-4d6f-a8ec-df51c961e605/
SH256 hash:
c9722b7bc4a2fb56261807055be611913de94da317b12be81bee29998bcfbcfd
MD5 hash:
a960c75a2ad6476f44fb367b088ca646
SHA1 hash:
6fc7413b6c4b591162ef7eb899205e8506a402dd
Link:
https://www.unpac.me/results/23353819-1edd-4d6f-a8ec-df51c961e605/
SH256 hash:
4d1ee061c817ea30ca4e461a4f44388662c1c1c2775be2b323858ddbc1679b35
MD5 hash:
1b6d3d31872537cc611ff4322ffc1099
SHA1 hash:
0108adafb207ce044bfb3f7933da45594c545bee
Link:
https://www.unpac.me/results/23353819-1edd-4d6f-a8ec-df51c961e605/
SH256 hash:
66a1b49f893976a60ca25813345ea54a5582acf7a5a0821c03cc45bcfc89b5c5
MD5 hash:
1d901aa6dded4bdf5e3dcec4393e53ce
SHA1 hash:
d85f4cf7ebf3bc594e303894fae9ae8c920ad4ad
Link:
https://www.unpac.me/results/23353819-1edd-4d6f-a8ec-df51c961e605/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/66a1b49f8939/report/overview.html
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/66a1b49f893976a60ca25813345ea54a5582acf7a5a0821c03cc45bcfc89b5c5

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:pe_imphash
Create hunting rule
Rule name:pe_imphash
Create hunting rule
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
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:Detects win.oski.

File information

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

Web download

OskiStealer

Executable exe 66a1b49f893976a60ca25813345ea54a5582acf7a5a0821c03cc45bcfc89b5c5

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/1715581/
  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/200659/

Comments