MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 79f2322a266f7ae7af5686670d8e8bc93661506340aab5e9d63fd23517bbbdd0. 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: 11


Intelligence 11 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 79f2322a266f7ae7af5686670d8e8bc93661506340aab5e9d63fd23517bbbdd0
SHA3-384 hash: 391c87b1c89274656c7887670bcf0f03683353ea0cd3ac8e28f397d0a0d56c5652c8209c53f94a43f3406658544fb9c2
SHA1 hash: c818383759ac632ba7b418e3a830d0a9e90b7cbb
MD5 hash: 83437762e281a39dd2e3d24a77bed412
humanhash: five-tango-spring-south
File name:83437762e281a39dd2e3d24a77bed412.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:1'335'808 bytes
First seen:2021-12-06 07:39:02 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'744 x AgentTesla, 19'610 x Formbook, 12'242 x SnakeKeylogger)
ssdeep 24576:3mFS9SCwOOFXkrusLQ6J39QvDDIhx/GkjHKUbt25M5PfybZML6sb/hyDVeb:rSxtxs7JivDDsx/djHu58KbZML
TLSH T107556A1D22B508ABE87D1A74142107374EF26C3D95BBE7CD3788355F4BB26840A267EE
File icon (PE):PE icon
dhash icon f4cccc9cd6dce4f4 (8 x AveMariaRAT, 3 x OskiStealer, 3 x AgentTesla)
Reporter abuse_ch
Tags:exe OskiStealer

Intelligence

File Origin
# of uploads :
1
# of downloads :
173
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
83437762e281a39dd2e3d24a77bed412.exe
Verdict:
Malicious activity
Analysis date:
2021-12-06 08:03:43 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/4b4f76b6-d7c5-4a2e-9792-b20329646990

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/211679/
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
DNS request
Сreating synchronization primitives
Launching a process
Creating a process with a hidden window
Creating a file in the %AppData% directory
Enabling the 'hidden' option for recently created files
Adding an access-denied ACE
Creating a process from a recently created file
Creating a file in the %temp% directory
Unauthorized injection to a recently created process
Enabling autorun by creating a file
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
obfuscated packed
Link:
https://www.filescan.io/uploads/61adbe1cfa72c81b5b0e0111/reports/a5331d9a-1f97-4c86-a071-87a83cf48057/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:
Formbook
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/0729a766-2572-4577-861c-18ee53890dbe
Result
Threat name:
Oski Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/902043
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)
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Posts data to a JPG file (protocol mismatch)
Sigma detected: Powershell Defender Exclusion
Sigma detected: Suspicius Add Task From User AppData Temp
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
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected AntiVM3
Yara detected Oski Stealer
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 534521 Sample: Z2mk5Raeya.exe Startdate: 06/12/2021 Architecture: WINDOWS Score: 100 51 Multi AV Scanner detection for domain / URL 2->51 53 Found malware configuration 2->53 55 Multi AV Scanner detection for dropped file 2->55 57 12 other signatures 2->57 8 Z2mk5Raeya.exe 7 2->8         started        process3 file4 35 C:\Users\user\AppData\Roaming\fOQvCYq.exe, PE32 8->35 dropped 37 C:\Users\user\AppData\Local\...\tmp64D0.tmp, XML 8->37 dropped 39 C:\Users\user\AppData\...\Z2mk5Raeya.exe.log, ASCII 8->39 dropped 59 Uses schtasks.exe or at.exe to add and modify task schedules 8->59 61 Adds a directory exclusion to Windows Defender 8->61 12 Z2mk5Raeya.exe 8->12         started        17 powershell.exe 24 8->17         started        19 powershell.exe 24 8->19         started        21 schtasks.exe 8->21         started        signatures5 process6 dnsIp7 49 swsaseguranca.com.br 162.241.203.110, 49760, 80 OIS1US United States 12->49 41 C:\ProgramData\vcruntime140.dll, PE32 12->41 dropped 43 C:\ProgramData\sqlite3.dll, PE32 12->43 dropped 45 C:\ProgramData\softokn3.dll, PE32 12->45 dropped 47 4 other files (none is malicious) 12->47 dropped 63 Tries to harvest and steal browser information (history, passwords, etc) 12->63 65 Tries to steal Crypto Currency Wallets 12->65 23 cmd.exe 12->23         started        25 conhost.exe 17->25         started        27 conhost.exe 19->27         started        29 conhost.exe 21->29         started        file8 signatures9 process10 process11 31 conhost.exe 23->31         started        33 taskkill.exe 23->33         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/79f2322a266f7ae7af5686670d8e8bc93661506340aab5e9d63fd23517bbbdd0/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2021-12-06 07:39:14 UTC
File Type:
PE (.Net Exe)
Extracted files:
23
AV detection:
22 of 27 (81.48%)
Threat level:
  5/5
Result
Malware family:
oski
Create hunting rule
Score:
  10/10
Tags:
family:oski discovery infostealer spyware stealer
Link:
https://tria.ge/reports/211206-jgz9qagda4/
Behaviour
Checks processor information in registry
Creates scheduled task(s)
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
Deletes itself
Loads dropped DLL
Reads user/profile data of web browsers
Downloads MZ/PE file
Oski
Malware Config
C2 Extraction:
swsaseguranca.com.br
Unpacked files
SH256 hash:
1eba3e6e55f4aa87ee88dad11183f808f00870bf6277e3ae19fb31400a1dbe5b
MD5 hash:
00b620728472aef2af115e0455930cf8
SHA1 hash:
649a4ad0f13a3176ea36b855c1b36fbce246446a
Link:
https://www.unpac.me/results/6b7fdb7b-67b7-4f64-aece-b1a27e16a717/
SH256 hash:
f02d190691fc369b69c971db79e9170e7ded91cfc96456a47c0099299600c817
MD5 hash:
dbf650c59171a3aba5f79042c4d2108d
SHA1 hash:
37c4f656e0249ce4e98ec58035806eca60c85f53
Link:
https://www.unpac.me/results/6b7fdb7b-67b7-4f64-aece-b1a27e16a717/
SH256 hash:
38b6394a173ce888e3e26cb07121ec8a02ce427b1839f329bc1f79e4f6e114a1
MD5 hash:
99ac177c0aef45dab05e79cb06e24bf1
SHA1 hash:
07c09f3aeebaa94905b34760ad5045f095d35c2c
Detections:
win_oski_g0
Create hunting rule
win_oski_auto
Create hunting rule
Link:
https://www.unpac.me/results/6b7fdb7b-67b7-4f64-aece-b1a27e16a717/
SH256 hash:
79f2322a266f7ae7af5686670d8e8bc93661506340aab5e9d63fd23517bbbdd0
MD5 hash:
83437762e281a39dd2e3d24a77bed412
SHA1 hash:
c818383759ac632ba7b418e3a830d0a9e90b7cbb
Link:
https://www.unpac.me/results/6b7fdb7b-67b7-4f64-aece-b1a27e16a717/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/79f2322a266f/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/79f2322a266f7ae7af5686670d8e8bc93661506340aab5e9d63fd23517bbbdd0

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.

Web download

OskiStealer

Executable exe 79f2322a266f7ae7af5686670d8e8bc93661506340aab5e9d63fd23517bbbdd0

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/1834087/
  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/211679/

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