MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 41257a21d27bcb773bb43e7b23c918d5ea4135a868b915d0fb738cd5c19af256. 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: 10


Intelligence 10 IOCs 7 YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 41257a21d27bcb773bb43e7b23c918d5ea4135a868b915d0fb738cd5c19af256
SHA3-384 hash: 4884b02bc535311c7025a07f07002d298928d7e993b5005c4f32dbdb118c59a808f11f3c62c3decfbcb786802619b062
SHA1 hash: 570ac186d2c608e312e4f7297c980f6defedd672
MD5 hash: b43530a300febef7443f5d1f24c77299
humanhash: colorado-victor-carpet-cup
File name:RFQ OM - RFQ No. OM-1267-V .exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:66'560 bytes
First seen:2022-05-26 03:16:31 UTC
Last seen:2022-05-26 03:31:42 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'737 x AgentTesla, 19'595 x Formbook, 12'238 x SnakeKeylogger)
ssdeep 768:qV+5uOi/1uFIZMYIIIIIIXllllllWvfIIQIWR1gRkg8Zg0kNK2Rpg3tNp1tnZDgk:i+wOCzHgeGUvDgk
Threatray 5'030 similar samples on MalwareBazaar
TLSH T1BA53F752B7048A85EA3B1B38842ADB900536AFBA7935D54944F47C637B33EC70C99CDB
TrID 72.5% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.4% (.EXE) Win64 Executable (generic) (10523/12/4)
6.5% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.4% (.EXE) Win32 Executable (generic) (4505/5/1)
2.0% (.EXE) OS/2 Executable (generic) (2029/13)
File icon (PE):PE icon
dhash icon 0b1333332b2f3333 (18 x AgentTesla, 5 x AveMariaRAT, 2 x OskiStealer)
Reporter abuse_ch
Tags:exe OskiStealer


Avatar
abuse_ch
OskiStealer C2:
http://yungfang.co.vu/6.jpg

Indicators Of Compromise (IOCs)

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

IOCThreatFox Reference
http://yungfang.co.vu/6.jpg https://threatfox.abuse.ch/ioc/635915/
http://yungfang.co.vu/1.jpg https://threatfox.abuse.ch/ioc/635916/
http://yungfang.co.vu/2.jpg https://threatfox.abuse.ch/ioc/635917/
http://yungfang.co.vu/3.jpg https://threatfox.abuse.ch/ioc/635918/
http://yungfang.co.vu/4.jpg https://threatfox.abuse.ch/ioc/635919/
http://yungfang.co.vu/5.jpg https://threatfox.abuse.ch/ioc/635920/
http://yungfang.co.vu/7.jpg https://threatfox.abuse.ch/ioc/635921/

Intelligence

File Origin
# of uploads :
2
# of downloads :
330
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
RFQ OM - RFQ No. OM-1267-V .exe
Verdict:
Suspicious activity
Analysis date:
2022-05-26 03:18:30 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/ce090c6e-4df7-43ba-954f-ce98b1b2685a

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/274647/
Detection(s):
SecuriteInfo.com.W32.AIDetectNet.01.2261.20748.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Сreating synchronization primitives
Running batch commands
Creating a process with a hidden window
Launching a process
Creating a file
Creating a window
Sending an HTTP GET request to an infection source
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
obfuscated packed
Link:
https://www.filescan.io/uploads/628ef1436eb3ff32632e7226/reports/da7ebd5d-c41c-4eb5-870d-877f781b97fa/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/d5ce6511-86cf-444e-a4ed-d53bd327e258
Result
Threat name:
Oski Stealer, Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1001945
Signature
.NET source code contains potential unpacker
Allocates memory in foreign processes
Antivirus / Scanner detection for submitted sample
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
DLL side loading technique detected
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
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for domain / URL
Posts data to a JPG file (protocol mismatch)
Snort IDS alert for network traffic
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Crypto Currency Wallets
Writes to foreign memory regions
Yara detected Generic Downloader
Yara detected Oski Stealer
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 634441 Sample: RFQ OM - RFQ No. OM-1267-V .exe Startdate: 26/05/2022 Architecture: WINDOWS Score: 100 48 Snort IDS alert for network traffic 2->48 50 Multi AV Scanner detection for domain / URL 2->50 52 Found malware configuration 2->52 54 12 other signatures 2->54 8 RFQ OM - RFQ No. OM-1267-V .exe 15 4 2->8         started        process3 dnsIp4 40 62.197.136.3, 49742, 80 SPRINTLINKUS Netherlands 8->40 30 C:\...\RFQ OM - RFQ No. OM-1267-V .exe.log, ASCII 8->30 dropped 56 Writes to foreign memory regions 8->56 58 Allocates memory in foreign processes 8->58 60 Injects a PE file into a foreign processes 8->60 13 MSBuild.exe 196 8->13         started        18 cmd.exe 1 8->18         started        file5 signatures6 process7 dnsIp8 42 chibuzorbaby.com 142.4.0.135, 49788, 49795, 80 UNIFIEDLAYER-AS-1US United States 13->42 44 192.168.2.1 unknown unknown 13->44 46 yungfang.co.vu 13->46 32 C:\ProgramData\sqlite3.dll, PE32 13->32 dropped 34 C:\ProgramData\vcruntime140.dll, PE32 13->34 dropped 36 C:\ProgramData\softokn3.dll, PE32 13->36 dropped 38 4 other files (none is malicious) 13->38 dropped 62 Tries to harvest and steal browser information (history, passwords, etc) 13->62 64 DLL side loading technique detected 13->64 66 Tries to steal Crypto Currency Wallets 13->66 20 cmd.exe 1 13->20         started        22 conhost.exe 18->22         started        24 timeout.exe 1 18->24         started        file9 signatures10 process11 process12 26 taskkill.exe 1 20->26         started        28 conhost.exe 20->28         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/41257a21d27bcb773bb43e7b23c918d5ea4135a868b915d0fb738cd5c19af256/
Threat name:
ByteCode-MSIL.Downloader.Seraph
Create hunting rule
Status:
Malicious
First seen:
2022-05-26 03:17:06 UTC
File Type:
PE (.Net Exe)
Extracted files:
4
AV detection:
18 of 26 (69.23%)
Threat level:
  3/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=iesxuiosppfxoo5uhz5shsiy2xvecnninc4rluh3oognlqm26jla._file
Verdict:
malicious
Similar samples:
11810610b0fcbfe0edc318d79ede6dcbb2c4b34dccbace91d3775001187c3c96
OskiStealer
191db013c67081442ef5e75edd00c2572f6ec9d7f629ddac9bba8942722c061d
OskiStealer
1a2bc82de6e0c26030a3600c836329329dbcf1d4d84e031a90dd7df5355ed612
OskiStealer
48d338ba06ada3da080eeeddb8a267b1b677dc9c3670f13e333ec8c73ff1b02c
OskiStealer
6107e3ec5898ce2f80b04ee16b3a41107a0733339cded01cf8c5ade5fc105472
OskiStealer
8399c97b606bb6613f99006964a47064e402e6489574b85db7a9872f601886b2
OskiStealer
ae672a54491d01385af7932cc9524889f6314dd4b4b8b9a846dfa1ffedaa8c61
OskiStealer
b8868eb87c7cb945704e2d0b8ec2ebdc890cd6df12f9ef0a7295582c7fd0cf1f
OskiStealer
+ 5'020 additional samples on MalwareBazaar
Result
Malware family:
oski
Create hunting rule
Score:
  10/10
Tags:
family:oski infostealer spyware suricata
Link:
https://tria.ge/reports/220526-ds2c9sfhd6/
Behaviour
Checks processor information in registry
Delays execution with timeout.exe
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 computer location settings
Loads dropped DLL
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:
yungfang.co.vu
Unpacked files
SH256 hash:
41257a21d27bcb773bb43e7b23c918d5ea4135a868b915d0fb738cd5c19af256
MD5 hash:
b43530a300febef7443f5d1f24c77299
SHA1 hash:
570ac186d2c608e312e4f7297c980f6defedd672
Link:
https://www.unpac.me/results/c6af1ee4-4de0-46f1-8a3a-eafa70a7828d/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/41257a21d27b/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.35
Link:
https://yomi.yoroi.company/submissions/41257a21d27bcb773bb43e7b23c918d5ea4135a868b915d0fb738cd5c19af256

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/274647/

Comments