MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 091fb99d751df7e9e867422f401ff7181adc35c6f90ad2c8aafd54e3ec724771. 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: 12


Intelligence 12 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 091fb99d751df7e9e867422f401ff7181adc35c6f90ad2c8aafd54e3ec724771
SHA3-384 hash: 56356ecaf55033e17635f04fb7b3882ef3b01a43d933bd3d1df0bc0618df840e8e5a39808c1a5f46dfe59f3cc56cc829
SHA1 hash: a7de5d41291af39b594698220bfaf27d23717428
MD5 hash: bbb6126304164468a0391e475be41aa0
humanhash: fillet-gee-tennis-fix
File name:New Bank Details.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:706'048 bytes
First seen:2021-09-07 07:17:04 UTC
Last seen:2021-09-07 13:05:07 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'744 x AgentTesla, 19'611 x Formbook, 12'242 x SnakeKeylogger)
ssdeep 6144:2rkT+ZID/jZgGtA3qe8DvZ1ZHRR6UQdKTdRGK0EM9uxxaWfPAh5jKRoZsiJ5FJLd:ukqwjDe8DBjHHWdKTiK4WXAh0uZs
Threatray 3'512 similar samples on MalwareBazaar
TLSH T1F3E42D3E58FE23279176C7D5CBE48823F6C498AF3233A96567D747264316A4634C322E
dhash icon 68f4f4d0f0f0d8c4 (4 x OskiStealer, 3 x AgentTesla, 2 x AsyncRAT)
Reporter GovCERT_CH
Tags:exe OskiStealer

Intelligence

File Origin
# of uploads :
3
# of downloads :
108
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
New Bank Details.exe
Verdict:
Malicious activity
Analysis date:
2021-09-07 07:18:53 UTC
Tags:
trojan stealer vidar loader
Link:
https://app.any.run/tasks/769d2c2e-e4f7-42eb-9671-3beb861d6aa2

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/185937/
Detection(s):
SecuriteInfo.com.Scr.Malcodegdn30.14643.29710.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Sending a UDP request
Launching a process
Creating a file
DNS request
Connection attempt
Deleting a recently created file
Reading critical registry keys
Replacing files
Delayed writing of the file
Running batch commands
Creating a process with a hidden window
Using the Windows Management Instrumentation requests
Searching for the window
Stealing user critical data
Launching a tool to kill processes
Unauthorized injection to a system process
Malware family:
Oski Stealer
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/3c7ee503-f3a8-46c2-bcc3-9822b020f3f8
Result
Threat name:
Oski Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/846340
Signature
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)
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for submitted file
Posts data to a JPG file (protocol mismatch)
Sigma detected: Bad Opsec Defaults Sacrificial Processes With Improper Arguments
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
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/091fb99d751df7e9e867422f401ff7181adc35c6f90ad2c8aafd54e3ec724771/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2021-09-07 07:18:07 UTC
AV detection:
8 of 39 (20.51%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=bep3thlvdx36t2dhiixuah7xdannynog7efnfsfk7vkoh3dsi5yq._file
Verdict:
malicious
Similar samples:
42c682af79cf1b73127ebf00349a8c4cabccdf42d2e14f77cda67121f870d8bf
OskiStealer
43460a1724b2521dd5e97c68c16edfce9caf22d49452efd956a64db91b5935a7
OskiStealer
44aa270e4c081241057bad8c1d0ea5864087325f8e3209aa10747f108123f718
OskiStealer
5953d0e6904dcb824fe1afde62ed8c2e2266f9f074514d395a31b759013e846f
OskiStealer
5ffe71b977866248e55612e20cea0bf3ad51a50896443d791081f58b49cdc5df
OskiStealer
83e8782266edec54f4c451f60e2095864c8a9d817e7296076e128c686a6bfea3
OskiStealer
a03b45dabcaf812402454befd876b2eafbdf9e967f3bb01e66f33f3cabbdebd5
OskiStealer
d950a4ee53971eb72e947a01bb1093a04676b7587fc0c6ccc26d9c964b1fc916
OskiStealer
+ 3'502 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/210907-h4e2mafddn/
Behaviour
Checks processor information in registry
Kills process with taskkill
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Suspicious use of SetThreadContext
Accesses cryptocurrency files/wallets, possible credential harvesting
Loads dropped DLL
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:
http://bctpump.us
Unpacked files
SH256 hash:
2c8bede227d4a399336529222e0f9e6b39fd1e9ebecc3a79671e06df2613b839
MD5 hash:
bbfbece426d1c5ddb890ad4c18e0d6e9
SHA1 hash:
bfb747055c82382f955cdc77e26f4a22b0cffc6c
Link:
https://www.unpac.me/results/de92079a-0914-4dc8-b0ba-7d03cc1e2727/
SH256 hash:
8e03f35b69cfaa3dd1969957d7947c91e56df9670ea6a5db5975c3376d359ee0
MD5 hash:
87017c5617759bca27207d528697bdc3
SHA1 hash:
919a1a153ab4b6d1b42a934e1b9741daa15db268
Detections:
win_oski_g0
Create hunting rule
win_oski_auto
Create hunting rule
Link:
https://www.unpac.me/results/de92079a-0914-4dc8-b0ba-7d03cc1e2727/
Parent samples :
7d12860910f95752bab43166470d3ac6dd1b8be3599bae2fca48aa1d01d1034a
5ffe71b977866248e55612e20cea0bf3ad51a50896443d791081f58b49cdc5df
2ca6487650676dfac02da8af32d2eea7c0a2162ff5c9881c54f698beac6921c4
091fb99d751df7e9e867422f401ff7181adc35c6f90ad2c8aafd54e3ec724771
21ac6486349c780cc40e9ab611d1e918a2919ba01d360572534c1da745b338a6
SH256 hash:
81f9eac76804c02f5baaa34c91b5775f965a34ad7811218d9c24e50cb6d9a90c
MD5 hash:
bae511742374b721136acaa03b0c1fa0
SHA1 hash:
215c50455b01a78ea173bbb034ddbe4b452ea734
Link:
https://www.unpac.me/results/de92079a-0914-4dc8-b0ba-7d03cc1e2727/
SH256 hash:
091fb99d751df7e9e867422f401ff7181adc35c6f90ad2c8aafd54e3ec724771
MD5 hash:
bbb6126304164468a0391e475be41aa0
SHA1 hash:
a7de5d41291af39b594698220bfaf27d23717428
Link:
https://www.unpac.me/results/de92079a-0914-4dc8-b0ba-7d03cc1e2727/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/091fb99d751d/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/091fb99d751df7e9e867422f401ff7181adc35c6f90ad2c8aafd54e3ec724771

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.

Malspam

OskiStealer

Executable exe 091fb99d751df7e9e867422f401ff7181adc35c6f90ad2c8aafd54e3ec724771

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/185937/

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