MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b1fb8aca24889f4446865d60a21b47b5214cebff2ee9f797ae49b7b3885b2cff. 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: 13


Intelligence 13 IOCs 7 YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b1fb8aca24889f4446865d60a21b47b5214cebff2ee9f797ae49b7b3885b2cff
SHA3-384 hash: 09037eae82e9350f677e9d7747711bccbac941aadc28c43ebefaa8c06af00ad0911bfe1313e01d01d249a6405995d74c
SHA1 hash: 04bf820780ced24814bf9a8ac4628f336a8cf596
MD5 hash: 8f3fb2446099de27ca50c13ad0d80245
humanhash: louisiana-queen-thirteen-twenty
File name:CTYH 53069184.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:637'440 bytes
First seen:2021-11-30 14:44:14 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'666 x AgentTesla, 19'479 x Formbook, 12'209 x SnakeKeylogger)
ssdeep 12288:gZHdS39eS2YPCj6FhluzVlWoBTYBLX6fVw5USGq0Ygsv:8HdStelyg6FPuZlWo2BmfkUSGq0Ygs
Threatray 4'163 similar samples on MalwareBazaar
TLSH T17BD4DF73618413B6F868C5F0F07204934F62A06652E07A7E2AA9F57F059DB69C30FF69
File icon (PE):PE icon
dhash icon f0f0f0f0f0f8f8f8 (4 x SnakeKeylogger, 2 x OskiStealer)
Reporter abuse_ch
Tags:exe OskiStealer


Avatar
abuse_ch
OskiStealer C2:
http://tecnomedica.com.py/6.jpg

Indicators Of Compromise (IOCs)

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

IOCThreatFox Reference
http://tecnomedica.com.py/6.jpg https://threatfox.abuse.ch/ioc/256458/
http://tecnomedica.com.py/1.jpg https://threatfox.abuse.ch/ioc/256459/
http://tecnomedica.com.py/2.jpg https://threatfox.abuse.ch/ioc/256460/
http://tecnomedica.com.py/3.jpg https://threatfox.abuse.ch/ioc/256461/
http://tecnomedica.com.py/4.jpg https://threatfox.abuse.ch/ioc/256462/
http://tecnomedica.com.py/5.jpg https://threatfox.abuse.ch/ioc/256463/
http://tecnomedica.com.py/7.jpg https://threatfox.abuse.ch/ioc/256464/

Intelligence

File Origin
# of uploads :
1
# of downloads :
150
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
CTYH 53069184.exe
Verdict:
Malicious activity
Analysis date:
2021-11-30 15:12:11 UTC
Tags:
trojan stealer vidar loader
Link:
https://app.any.run/tasks/73325b34-1267-4fd8-8bd5-f0c458db0ecf

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
Vidar
Create hunting rule
Link:
https://www.capesandbox.com/analysis/209960/
Result
Verdict:
Suspicious
Maliciousness:

Behaviour
Searching for the window
Creating a window
DNS request
Sending a custom TCP request
Launching a process
Creating a process with a hidden window
Creating a file
Running batch commands
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
obfuscated packed
Link:
https://www.filescan.io/uploads/61a638f1bbfd2af97cbcc340/reports/2e791b5a-cd60-4d67-a653-c5057b344664/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/dd99cb03-616b-4534-a630-774e65a8cd74
Result
Threat name:
Oski Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/898765
Signature
.NET source code contains potential unpacker
Adds a directory exclusion to Windows Defender
C2 URLs / IPs found in malware configuration
Downloads files with wrong headers with respect to MIME Content-Type
Found malware configuration
Found many strings related to Crypto-Wallets (likely being stolen)
Injects a PE file into a foreign processes
Multi AV Scanner detection for submitted file
Posts data to a JPG file (protocol mismatch)
Sigma detected: Powershell Defender Exclusion
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: 531240 Sample: CTYH 53069184.exe Startdate: 30/11/2021 Architecture: WINDOWS Score: 100 41 Found malware configuration 2->41 43 Multi AV Scanner detection for submitted file 2->43 45 Yara detected Oski Stealer 2->45 47 10 other signatures 2->47 8 CTYH 53069184.exe 4 2->8         started        process3 file4 29 C:\Users\user\...\CTYH 53069184.exe.log, ASCII 8->29 dropped 49 Adds a directory exclusion to Windows Defender 8->49 51 Injects a PE file into a foreign processes 8->51 12 CTYH 53069184.exe 196 8->12         started        17 powershell.exe 25 8->17         started        19 CTYH 53069184.exe 8->19         started        signatures5 process6 dnsIp7 39 tecnomedica.com.py 216.172.171.133, 49736, 49744, 80 UNIFIEDLAYER-AS-1US United States 12->39 31 C:\ProgramData\vcruntime140.dll, PE32 12->31 dropped 33 C:\ProgramData\sqlite3.dll, PE32 12->33 dropped 35 C:\ProgramData\softokn3.dll, PE32 12->35 dropped 37 4 other files (none is malicious) 12->37 dropped 53 Tries to harvest and steal browser information (history, passwords, etc) 12->53 55 Tries to steal Crypto Currency Wallets 12->55 21 cmd.exe 1 12->21         started        23 conhost.exe 17->23         started        file8 signatures9 process10 process11 25 taskkill.exe 1 21->25         started        27 conhost.exe 21->27         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b1fb8aca24889f4446865d60a21b47b5214cebff2ee9f797ae49b7b3885b2cff/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2021-11-30 14:45:10 UTC
File Type:
PE (.Net Exe)
Extracted files:
8
AV detection:
23 of 27 (85.19%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=wh5yvsrercpuiruglvqkeg2hwuquz277f3u7pf5ojg33hcc3ft7q._file
Verdict:
malicious
Similar samples:
192f884438809d6fb01ae0c89c4ccd1fdae62d429e78bdbcc4ff4d28a54049af
OskiStealer
4ee9983bc82214479876383c1caa6c1800df1d9d9bc733bf0be74150570b12d0
OskiStealer
66a1b49f893976a60ca25813345ea54a5582acf7a5a0821c03cc45bcfc89b5c5
OskiStealer
b43dde5ca3d23d16af5bf34c522869dff9624a78be67dfc3acde5c81ef24d318
OskiStealer
b70f4075c4ce52960faacb101aac17a9cd734cbec86b6a9d63944e900420bde1
OskiStealer
c17243e46ff224631e589c55642c3666e5c560715841e8b8ebdd511cb70da8dd
OskiStealer
+ 4'153 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/211130-r4qmssfbhq/
Behaviour
Checks processor information in registry
Kills process with taskkill
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
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:
tecnomedica.com.py
Unpacked files
SH256 hash:
429b2035a5f8d72e946f3fa21effc3560893c25a3c5632e2625b6acf878f7cc2
MD5 hash:
e27aa813ac143bcdad49a4311700934b
SHA1 hash:
9972b58a9a0eaa56f2dd644711335f254291876a
Detections:
win_oski_g0
Create hunting rule
win_oski_auto
Create hunting rule
Link:
https://www.unpac.me/results/7bdb85ec-42ce-427f-963c-bbb038f76c80/
SH256 hash:
a06ada3ac214af8c2e894d74be42bdd487e3995ac2c0bab9af3264fd3f3796aa
MD5 hash:
743515d25d6f83abf93872aa9214efee
SHA1 hash:
8b5eeb69bb14d4c398e59dd481f19a784c09811a
Link:
https://www.unpac.me/results/7bdb85ec-42ce-427f-963c-bbb038f76c80/
SH256 hash:
b19104b568ca3ddccc2a8d3d10ecddb1ea240171e798dc3a486292cfa14b6365
MD5 hash:
7b0900da932f4ed9630d65b04422736d
SHA1 hash:
6fa340436e3a8e73ae2b3e911f861483183c68ef
Link:
https://www.unpac.me/results/7bdb85ec-42ce-427f-963c-bbb038f76c80/
SH256 hash:
b1fb8aca24889f4446865d60a21b47b5214cebff2ee9f797ae49b7b3885b2cff
MD5 hash:
8f3fb2446099de27ca50c13ad0d80245
SHA1 hash:
04bf820780ced24814bf9a8ac4628f336a8cf596
Link:
https://www.unpac.me/results/7bdb85ec-42ce-427f-963c-bbb038f76c80/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/b1fb8aca2488/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/b1fb8aca24889f4446865d60a21b47b5214cebff2ee9f797ae49b7b3885b2cff

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:INDICATOR_SUSPICIOUS_Stomped_PECompilation_Timestamp_InTheFuture
Create hunting rule
Author:ditekSHen
Description:Detect executables with stomped PE compilation timestamp that is greater than local current time
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

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/209960/

Comments