MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b990b5f072914cba8f10f88932ce5be9feff9760f7a1a20d562f885915ca9423. 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: 14


Intelligence 14 IOCs 7 YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b990b5f072914cba8f10f88932ce5be9feff9760f7a1a20d562f885915ca9423
SHA3-384 hash: c54edbaacec84b85c5b9127248d764485e2c00c76f17668e201ed9f9db67c3075114e9d75430bc5d784c94cee5b3ef28
SHA1 hash: 5eaf10eec6cbbace9fa89f191c8d95a477041067
MD5 hash: 4ffb6091ba5ec0d9ca7bd79107ca6fae
humanhash: lima-nuts-avocado-saturn
File name:SecuriteInfo.com.W32.AIDetectNet.01.18479.7322
Download: download sample
Signature OskiStealer
Create hunting rule
File size:614'400 bytes
First seen:2022-05-17 08:53:56 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:k1vNfoA3/dLa6cnVc8SIFq9QT0XfHf+vZRyzVm0W:uhoA3/dLa6cnVcNAT0Xfg3yZP
Threatray 1'159 similar samples on MalwareBazaar
TLSH T1D9D412226279DBB6DEBD3BFE6824411813B6925B2813E7BC4FC5A0CB1516B549780F23
TrID 63.0% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
11.3% (.SCR) Windows screen saver (13101/52/3)
9.0% (.EXE) Win64 Executable (generic) (10523/12/4)
5.6% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
3.8% (.EXE) Win32 Executable (generic) (4505/5/1)
Reporter SecuriteInfoCom
Tags:exe OskiStealer

Indicators Of Compromise (IOCs)

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

IOCThreatFox Reference
http://unitech.co.vu/6.jpg https://threatfox.abuse.ch/ioc/574605/
http://unitech.co.vu/1.jpg https://threatfox.abuse.ch/ioc/574606/
http://unitech.co.vu/2.jpg https://threatfox.abuse.ch/ioc/574607/
http://unitech.co.vu/3.jpg https://threatfox.abuse.ch/ioc/574609/
http://unitech.co.vu/4.jpg https://threatfox.abuse.ch/ioc/574610/
http://unitech.co.vu/5.jpg https://threatfox.abuse.ch/ioc/574611/
http://unitech.co.vu/7.jpg https://threatfox.abuse.ch/ioc/574612/

Intelligence

File Origin
# of uploads :
1
# of downloads :
213
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
vidar
Create hunting rule
ID:
1
File name:
SecuriteInfo.com.W32.AIDetectNet.01.18479.7322
Verdict:
Malicious activity
Analysis date:
2022-05-18 05:25:25 UTC
Tags:
trojan stealer vidar loader
Link:
https://app.any.run/tasks/7c088189-dc5d-40c8-bd2d-02a482c354d2

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/271428/
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a window
Launching a process
Creating a process with a hidden window
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
obfuscated packed replace.exe update.exe
Link:
https://www.filescan.io/uploads/628362bbcc43366302d08a6a/reports/32054c5c-f543-471d-9db5-4c3e6809e28e/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/54ac4ac2-dff0-4546-856b-56e379c3bb7b
Result
Threat name:
Oski Stealer, Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/995676
Signature
.NET source code contains method to dynamically call methods (often used by packers)
.NET source code contains potential unpacker
Adds a directory exclusion to Windows Defender
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
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Posts data to a JPG file (protocol mismatch)
Snort IDS alert for network traffic
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 Generic Downloader
Yara detected Oski Stealer
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 628172 Sample: SecuriteInfo.com.W32.AIDete... Startdate: 17/05/2022 Architecture: WINDOWS Score: 100 53 Snort IDS alert for network traffic 2->53 55 Malicious sample detected (through community Yara rule) 2->55 57 Multi AV Scanner detection for dropped file 2->57 59 13 other signatures 2->59 8 SecuriteInfo.com.W32.AIDetectNet.01.18479.exe 7 2->8         started        process3 file4 33 C:\Users\user\AppData\Roaming\FidlFl.exe, PE32 8->33 dropped 35 C:\Users\user\...\FidlFl.exe:Zone.Identifier, ASCII 8->35 dropped 37 C:\Users\user\AppData\Local\...\tmp8DC7.tmp, XML 8->37 dropped 39 SecuriteInfo.com.W...et.01.18479.exe.log, ASCII 8->39 dropped 61 Uses schtasks.exe or at.exe to add and modify task schedules 8->61 63 Adds a directory exclusion to Windows Defender 8->63 65 Injects a PE file into a foreign processes 8->65 12 SecuriteInfo.com.W32.AIDetectNet.01.18479.exe 196 8->12         started        17 powershell.exe 25 8->17         started        19 schtasks.exe 1 8->19         started        21 2 other processes 8->21 signatures5 process6 dnsIp7 49 chibuzorbaby.com 142.4.0.135, 49779, 49794, 80 UNIFIEDLAYER-AS-1US United States 12->49 51 unitech.co.vu 12->51 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 67 Tries to harvest and steal browser information (history, passwords, etc) 12->67 69 Tries to steal Crypto Currency Wallets 12->69 23 cmd.exe 12->23         started        25 conhost.exe 17->25         started        27 conhost.exe 19->27         started        file8 signatures9 process10 process11 29 conhost.exe 23->29         started        31 taskkill.exe 23->31         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b990b5f072914cba8f10f88932ce5be9feff9760f7a1a20d562f885915ca9423/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2022-05-17 01:16:11 UTC
File Type:
PE (.Net Exe)
Extracted files:
10
AV detection:
18 of 26 (69.23%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=xgill4dssfglvdyq7cetfts35h7p7f3a66q2edkwf6efsfoksqrq._file
Verdict:
malicious
Similar samples:
0ea15b9ec035699d4ee1d98bea3df84f705f99e9ea26c441289dece715085b7e
OskiStealer
68a837f8646bc09c634d13045d36ee05f43f319e88c2a47295d01c47574accae
OskiStealer
87997dcb5faa3bbebe58faa2efc382628cc2ec78a0ba0bd4bed2fc03fc4b9d4b
OskiStealer
a1d01c0e1a1d513991939e0a16abc25ed3927f78102a24b6af85f09fbfb27567
OskiStealer
e92c86e5d98095c3dbf954ff712640ceeb7d22b11971bec837a489bfc166d691
OskiStealer
eeb90eb50b8eeaf8cb80685a1e913f1bfc64ed65f9944aa0849893ddf5020ccb
OskiStealer
f1fa2559638f8161d79b3cccc49942fe9faa52198ff91af0213d13b915b21b90
OskiStealer
+ 1'149 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/220517-ktvqfacceq/
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
Checks computer location settings
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 Suspicious Zipped Filename in Outbound POST Request (Passwords.txt) M2
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern
Malware Config
C2 Extraction:
unitech.co.vu
Unpacked files
SH256 hash:
97527da0af9e8321eb6aa2c760bc3a6453341b0fef90c44595a02945c2dd3144
MD5 hash:
332f0164e6b19699174c491d839d6ec9
SHA1 hash:
eadeadeaf7bf3978d86d633bd054e4ff317ecc40
Link:
https://www.unpac.me/results/bff40398-3a12-4c9e-a2a2-7edd5b2b7d32/
SH256 hash:
f8901055e7b5bafc04e9138d4ba33939a9bb4df5d3854c6b44312d1edcf2108e
MD5 hash:
325f39f960eeb553ee755ae47b0239d8
SHA1 hash:
bea1771c8942fc83ee9d16c136e7d5824667fb66
Link:
https://www.unpac.me/results/bff40398-3a12-4c9e-a2a2-7edd5b2b7d32/
SH256 hash:
522c1570aeb53ccb53b05ff3424426d21db1689bd790ae1de6e0b7f77ff1f2a1
MD5 hash:
cbf3f7ce8cbe25efb8d35517b187b03e
SHA1 hash:
a1bc13585c27267f87e8b21a25262d51b7bdb974
Link:
https://www.unpac.me/results/bff40398-3a12-4c9e-a2a2-7edd5b2b7d32/
SH256 hash:
29c14233e9f39489fb1ea7a21c39c916059f2532ea8b1c015f00c84624409576
MD5 hash:
a6071f6bec8bb24bdf9d4275b6587d0e
SHA1 hash:
01c4909c79daa8fe1f47a4a501900354a40c5f90
Detections:
win_oski_g0
Create hunting rule
win_oski_auto
Create hunting rule
Link:
https://www.unpac.me/results/bff40398-3a12-4c9e-a2a2-7edd5b2b7d32/
Parent samples :
03e727533b2ca8ed0dd10444ce7e95ef19334124fb3014fb090784b2371957b9
35f377ad1b6647c04b0967c7825c96360fe035ae7b0fac43380a1cccc8969d85
95e67dec1a50e9a83fbb5b430c1b21b851e1f0aa8da0ee9efbece3085ad4c462
5b934219ee24cde16acffda6640ac940cfd7f6bdcb93aad90919c89e84343727
b990b5f072914cba8f10f88932ce5be9feff9760f7a1a20d562f885915ca9423
cd238eae8acd5aaece92a1c264437fedea2fd7088df8353d81cdfd6af037e69b
SH256 hash:
b990b5f072914cba8f10f88932ce5be9feff9760f7a1a20d562f885915ca9423
MD5 hash:
4ffb6091ba5ec0d9ca7bd79107ca6fae
SHA1 hash:
5eaf10eec6cbbace9fa89f191c8d95a477041067
Link:
https://www.unpac.me/results/bff40398-3a12-4c9e-a2a2-7edd5b2b7d32/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/b990b5f07291/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/b990b5f072914cba8f10f88932ce5be9feff9760f7a1a20d562f885915ca9423

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: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/271428/

Comments