MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 931f271552b5170cbcee380f9fc5742d890e9063181645f010cf0b942ea2787a. 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 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 931f271552b5170cbcee380f9fc5742d890e9063181645f010cf0b942ea2787a
SHA3-384 hash: c2e959b81e82e74b2490f1e7803d303b351738dad6812c2d9aedf4989c9ec5f767f711febb769b5408de0dbb495bbf99
SHA1 hash: 03961f74b258f17af2769d78a3c01a6acc7bda9c
MD5 hash: 8fba526b759a51885a2f1a0f26ae040f
humanhash: fanta-iowa-south-solar
File name:8fba526b759a51885a2f1a0f26ae040f.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:1'459'200 bytes
First seen:2021-12-14 06:51:08 UTC
Last seen:2021-12-14 09:12:02 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'652 x AgentTesla, 19'463 x Formbook, 12'204 x SnakeKeylogger)
ssdeep 24576:HYYjWdnynpP8k4pb0DK6nB6h5Cqk+ys+zQ2bN4V6pEanUoLVQQHwlYGG:HVWdyp/U4DKwi5lre4KjhuuGG
Threatray 4'102 similar samples on MalwareBazaar
TLSH T1B065226D3A679BCFC87A07B87328507423706E32660BE39CF89931DB19237493973956
File icon (PE):PE icon
dhash icon b3b3333969693b3b (69 x Formbook, 63 x AgentTesla, 26 x Loki)
Reporter abuse_ch
Tags:exe OskiStealer


Avatar
abuse_ch
OskiStealer C2:
http://golfhomexpresx.ir/6.jpg

Indicators Of Compromise (IOCs)

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

IOCThreatFox Reference
http://golfhomexpresx.ir/6.jpg https://threatfox.abuse.ch/ioc/275533/
http://golfhomexpresx.ir/1.jpg https://threatfox.abuse.ch/ioc/275534/
http://golfhomexpresx.ir/2.jpg https://threatfox.abuse.ch/ioc/275535/
http://golfhomexpresx.ir/3.jpg https://threatfox.abuse.ch/ioc/275536/
http://golfhomexpresx.ir/4.jpg https://threatfox.abuse.ch/ioc/275537/
http://golfhomexpresx.ir/5.jpg https://threatfox.abuse.ch/ioc/275538/
http://golfhomexpresx.ir/7.jpg https://threatfox.abuse.ch/ioc/275539/

Intelligence

File Origin
# of uploads :
2
# of downloads :
142
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
8fba526b759a51885a2f1a0f26ae040f.exe
Verdict:
Malicious activity
Analysis date:
2021-12-14 06:54:48 UTC
Tags:
trojan stealer vidar loader
Link:
https://app.any.run/tasks/73454252-906c-48f0-bda5-b7ad3676ed79

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/213831/
Detection(s):
SecuriteInfo.com.Trojan.Inject4.22093.23935.19166.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a window
DNS request
Unauthorized injection to a recently created process
Creating a file
Reading critical registry keys
Delayed writing of the file
Сreating synchronization primitives
Running batch commands
Creating a process with a hidden window
Stealing user critical data
Launching a tool to kill processes
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
greyware obfuscated packed
Link:
https://www.filescan.io/uploads/61b83f1747bb875c085c7b36/reports/f44bcb0f-109b-4cfc-a2f9-b51ecaa29702/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/dcb03cb6-0ff1-4ff0-aa1d-95af45bdb5a2
Result
Threat name:
Oski Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/906887
Signature
.NET source code contains potential unpacker
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)
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: 539366 Sample: EWpzAO30n7.exe Startdate: 14/12/2021 Architecture: WINDOWS Score: 100 35 Found malware configuration 2->35 37 Multi AV Scanner detection for submitted file 2->37 39 Yara detected Oski Stealer 2->39 41 8 other signatures 2->41 8 EWpzAO30n7.exe 3 2->8         started        process3 file4 23 C:\Users\user\AppData\...WpzAO30n7.exe.log, ASCII 8->23 dropped 43 Injects a PE file into a foreign processes 8->43 12 EWpzAO30n7.exe 196 8->12         started        signatures5 process6 dnsIp7 33 golfhomexpresx.ir 104.21.96.64, 49744, 80 CLOUDFLARENETUS United States 12->33 25 C:\ProgramData\vcruntime140.dll, PE32 12->25 dropped 27 C:\ProgramData\sqlite3.dll, PE32 12->27 dropped 29 C:\ProgramData\softokn3.dll, PE32 12->29 dropped 31 4 other files (none is malicious) 12->31 dropped 45 Tries to harvest and steal browser information (history, passwords, etc) 12->45 47 Tries to steal Crypto Currency Wallets 12->47 17 cmd.exe 1 12->17         started        file8 signatures9 process10 process11 19 taskkill.exe 1 17->19         started        21 conhost.exe 17->21         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/931f271552b5170cbcee380f9fc5742d890e9063181645f010cf0b942ea2787a/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2021-12-14 06:52:14 UTC
File Type:
PE (.Net Exe)
Extracted files:
9
AV detection:
22 of 28 (78.57%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=smpsofkswulqzphohahz7rlufweq5edddalel4aqz4fzilvcpb5a._file
Verdict:
malicious
Similar samples:
192f884438809d6fb01ae0c89c4ccd1fdae62d429e78bdbcc4ff4d28a54049af
OskiStealer
66a1b49f893976a60ca25813345ea54a5582acf7a5a0821c03cc45bcfc89b5c5
OskiStealer
6b869d8825516d0b977d48043d1d56d233de7b128074b068566dc33e0ff9fdb7
OskiStealer
b70f4075c4ce52960faacb101aac17a9cd734cbec86b6a9d63944e900420bde1
OskiStealer
c17243e46ff224631e589c55642c3666e5c560715841e8b8ebdd511cb70da8dd
OskiStealer
e447edf7c703f03c3644f4d8b896974b7bfa59e7bc4036af5a800c7135dd09b0
OskiStealer
+ 4'092 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/211214-hm325agcfk/
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:
golfhomexpresx.ir
Unpacked files
SH256 hash:
78b239e6ad0145fd455f6e380107f14f1b4ec2e688e0cd1cc607224311f14e6e
MD5 hash:
9459f774b03232f9af464e70564f6b7a
SHA1 hash:
ffc16ac0aed6a7ff4602b12dacfc462c47042bde
Link:
https://www.unpac.me/results/2e0a5760-6001-400b-b8d9-4d4c3a240329/
SH256 hash:
58ffaa98ea23de16e10355dbf4d7bbce13b45b16102da499b003fd707b4eb5ba
MD5 hash:
5e0f5cdbc6104a979cc92ba293b3b1c9
SHA1 hash:
124a5d02b50da7caa078d4cae6d7ad455a7a2e26
Detections:
win_oski_g0
Create hunting rule
win_oski_auto
Create hunting rule
Link:
https://www.unpac.me/results/2e0a5760-6001-400b-b8d9-4d4c3a240329/
Parent samples :
125b5a322966a51616fad074a1d5aa4dd1979ff453889d55b01aedd9fa54262e
931f271552b5170cbcee380f9fc5742d890e9063181645f010cf0b942ea2787a
fb142a5509971d78923e077c658479a60287c1e6d921adfc75f3a426b5ffab7b
f62eb2c218ce5b7958aa7fcd2aa5c604fcc571e10bb4c373bb396d9e85733e44
3a1643bbeb085792684f579b51b1da8d3adbd40e0e4815ab6d92d30d5c7e1f33
cabe623befbaa25599e9c97bef6be8175332b29c6571a2c8e755c7a732beedbd
SH256 hash:
e0084dc966cde73684bf17440a6f8585c399b12e204512e0674ee4e0c2994fd7
MD5 hash:
6b75c5d6dbe7e05cde9bf5de4a916bba
SHA1 hash:
0bfad56382c341b0a75214c94ff075c4e922dc85
Link:
https://www.unpac.me/results/2e0a5760-6001-400b-b8d9-4d4c3a240329/
SH256 hash:
931f271552b5170cbcee380f9fc5742d890e9063181645f010cf0b942ea2787a
MD5 hash:
8fba526b759a51885a2f1a0f26ae040f
SHA1 hash:
03961f74b258f17af2769d78a3c01a6acc7bda9c
Link:
https://www.unpac.me/results/2e0a5760-6001-400b-b8d9-4d4c3a240329/
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/931f271552b5170cbcee380f9fc5742d890e9063181645f010cf0b942ea2787a

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: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 931f271552b5170cbcee380f9fc5742d890e9063181645f010cf0b942ea2787a

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/1862603/
  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/213831/

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