MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 21ac6486349c780cc40e9ab611d1e918a2919ba01d360572534c1da745b338a6. 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: 21ac6486349c780cc40e9ab611d1e918a2919ba01d360572534c1da745b338a6
SHA3-384 hash: e0cf517bce3f4311fd7fd6b46bf5daeb9976ec36732abc2f6f76234dc4cd18a69b14106b10d2b6ce9998281252304d7a
SHA1 hash: 070cfe904832823ca25d55c43a10ef60dd20b9d7
MD5 hash: c3de624067049248dc153633dbcf6cec
humanhash: princess-sweet-glucose-sodium
File name:Payment_Advice.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:466'944 bytes
First seen:2021-09-10 07:20:32 UTC
Last seen:2021-09-10 12:52:30 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'744 x AgentTesla, 19'610 x Formbook, 12'242 x SnakeKeylogger)
ssdeep 12288:q/5YDA8Pu0bIkZLAhQCns98mY2LDFOep9dgsKOzSqsR:QJ8P77mhQCm/DFO67gsKkG
Threatray 3'545 similar samples on MalwareBazaar
TLSH T1C8A412233268826FCCBC19F8B4A80299C775222A66D3E3CD1FA225ED50D77D65651CE3
dhash icon 68f4f4d0f0f0d8c4 (4 x OskiStealer, 3 x AgentTesla, 2 x AsyncRAT)
Reporter GovCERT_CH
Tags:exe OskiStealer

Intelligence

File Origin
# of uploads :
2
# of downloads :
136
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Payment_Advice.exe
Verdict:
Malicious activity
Analysis date:
2021-09-10 07:23:10 UTC
Tags:
trojan stealer vidar loader
Link:
https://app.any.run/tasks/a2c668c0-ebd5-4ab8-a4f6-fc3bba209ecf

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/186811/
Detection(s):
SecuriteInfo.com.MSIL.Kryptik.VFR-1.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/38d408cf-0ae1-4ee1-9824-8d9858c45cbc
Result
Threat name:
Oski Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/848635
Signature
.NET source code contains potential unpacker
DLL side loading technique detected
Downloads files with wrong headers with respect to MIME Content-Type
Executable has a suspicious name (potential lure to open the executable)
Found malware configuration
Found many strings related to Crypto-Wallets (likely being stolen)
Initial sample is a PE file and has a suspicious name
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
behaviorgraph top1 signatures2 2 Behavior Graph ID: 481066 Sample: Payment_Advice.exe Startdate: 10/09/2021 Architecture: WINDOWS Score: 100 36 Multi AV Scanner detection for domain / URL 2->36 38 Found malware configuration 2->38 40 Multi AV Scanner detection for submitted file 2->40 42 11 other signatures 2->42 8 Payment_Advice.exe 3 2->8         started        process3 file4 24 C:\Users\user\...\Payment_Advice.exe.log, ASCII 8->24 dropped 11 RegSvcs.exe 196 8->11         started        16 RegSvcs.exe 8->16         started        process5 dnsIp6 34 bctpump.us 162.241.123.16, 49732, 80 UNIFIEDLAYER-AS-1US United States 11->34 26 C:\ProgramData\sqlite3.dll, PE32 11->26 dropped 28 C:\ProgramData\vcruntime140.dll, PE32 11->28 dropped 30 C:\ProgramData\softokn3.dll, PE32 11->30 dropped 32 4 other files (none is malicious) 11->32 dropped 44 Tries to harvest and steal browser information (history, passwords, etc) 11->44 46 DLL side loading technique detected 11->46 48 Tries to steal Crypto Currency Wallets 11->48 18 cmd.exe 1 11->18         started        file7 signatures8 process9 process10 20 taskkill.exe 1 18->20         started        22 conhost.exe 18->22         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/21ac6486349c780cc40e9ab611d1e918a2919ba01d360572534c1da745b338a6/
Threat name:
ByteCode-MSIL.Trojan.Generic
Create hunting rule
Status:
Suspicious
First seen:
2021-09-10 03:36:20 UTC
AV detection:
4 of 44 (9.09%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=egwgjbrutr4azraotk3bdupjdcrjdg5adu3ak4stjqo2ornthcta._file
Verdict:
malicious
Similar samples:
10410848d808e42758883ff2045ac5b10d16ad3d4155771483f0aba1f245a6e4
OskiStealer
42c682af79cf1b73127ebf00349a8c4cabccdf42d2e14f77cda67121f870d8bf
OskiStealer
5953d0e6904dcb824fe1afde62ed8c2e2266f9f074514d395a31b759013e846f
OskiStealer
5ffe71b977866248e55612e20cea0bf3ad51a50896443d791081f58b49cdc5df
OskiStealer
a03b45dabcaf812402454befd876b2eafbdf9e967f3bb01e66f33f3cabbdebd5
OskiStealer
c254079e9a75cb708e28deb9c72c77689c53425f8256338343c06285bed8ebbe
OskiStealer
d950a4ee53971eb72e947a01bb1093a04676b7587fc0c6ccc26d9c964b1fc916
OskiStealer
f5abfba489bfcef9819f0ca20cd54efc779d6091f6462b6083c363636739f41b
OskiStealer
+ 3'535 additional samples on MalwareBazaar
Result
Malware family:
oski
Create hunting rule
Score:
  10/10
Tags:
family:oski infostealer spyware
Link:
https://tria.ge/reports/210910-h6m51shff4/
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
Malware Config
C2 Extraction:
http://bctpump.us
Unpacked files
SH256 hash:
ad4a7895d529d5164302bb88596964ab42ff125bf0f5544418c80b6d438cb587
MD5 hash:
43ababb6b0a02907aad43084f12b10d9
SHA1 hash:
b60ba705891d5a666d64300181b475a46714ffa8
Link:
https://www.unpac.me/results/f72d6f43-0710-471d-85c5-51445e7c1de0/
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/f72d6f43-0710-471d-85c5-51445e7c1de0/
Parent samples :
7d12860910f95752bab43166470d3ac6dd1b8be3599bae2fca48aa1d01d1034a
5ffe71b977866248e55612e20cea0bf3ad51a50896443d791081f58b49cdc5df
2ca6487650676dfac02da8af32d2eea7c0a2162ff5c9881c54f698beac6921c4
091fb99d751df7e9e867422f401ff7181adc35c6f90ad2c8aafd54e3ec724771
21ac6486349c780cc40e9ab611d1e918a2919ba01d360572534c1da745b338a6
SH256 hash:
53ecc5290614d47e6c511b9bdecc9c9c8aae26916126f399295d1552d13434b5
MD5 hash:
7bf739a4f4c4fe4b0f0191da57532257
SHA1 hash:
844f08785f8f5c72ded3802e515ddad2ac7dcfc9
Link:
https://www.unpac.me/results/f72d6f43-0710-471d-85c5-51445e7c1de0/
SH256 hash:
21ac6486349c780cc40e9ab611d1e918a2919ba01d360572534c1da745b338a6
MD5 hash:
c3de624067049248dc153633dbcf6cec
SHA1 hash:
070cfe904832823ca25d55c43a10ef60dd20b9d7
Link:
https://www.unpac.me/results/f72d6f43-0710-471d-85c5-51445e7c1de0/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/21ac6486349c/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/21ac6486349c780cc40e9ab611d1e918a2919ba01d360572534c1da745b338a6

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 21ac6486349c780cc40e9ab611d1e918a2919ba01d360572534c1da745b338a6

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/186811/

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