MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 916bd03b40de6bfa498311e3a70d3e98c50e8255fd413d446daab77951224856. 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 YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 916bd03b40de6bfa498311e3a70d3e98c50e8255fd413d446daab77951224856
SHA3-384 hash: 3ae532697b631bbf518c22e9af291c1efd3e3ee78b6b72ed3225009ee69a6b224284c82027b1471547c1370d06601375
SHA1 hash: 0ca33aaffac24eb52da8670bb617642d78bd46ab
MD5 hash: 015f45de6bf81ded8c921435c471d087
humanhash: california-don-tango-indigo
File name:015f45de_by_Libranalysis
Download: download sample
Signature OskiStealer
Create hunting rule
File size:233'784 bytes
First seen:2021-05-03 10:01:01 UTC
Last seen:2021-05-03 13:05:10 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'742 x AgentTesla, 19'606 x Formbook, 12'242 x SnakeKeylogger)
ssdeep 6144:o4ORWKb8UtfUeAIQHuA36cdZn2qcDS6VBrNfBsRW:FOyUeeAItC66wJDXlpsR
Threatray 1'100 similar samples on MalwareBazaar
TLSH AF34F1008EC8D71AC9780936EDF5C134BB716F10AC22E5D75C6FB2696B36790B414E6B
Reporter Libranalysis
Tags:OskiStealer


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Libranalysis
Uploaded as part of the sample sharing project

Intelligence

File Origin
# of uploads :
3
# of downloads :
116
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
PL_017_603_789.xlsx
Verdict:
Malicious activity
Analysis date:
2021-05-03 07:37:43 UTC
Tags:
exploit CVE-2017-11882 loader
Link:
https://app.any.run/tasks/c90622fe-c4bb-413c-a68e-2b1bbe28c388

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/148369/
Detection(s):
SecuriteInfo.com.Win32.RATX-genTrj.14361.8491.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
DNS request
Sending an HTTP GET request
Sending a UDP request
Creating a file in the %temp% directory
Creating a process from a recently created file
Creating a file
Connection attempt
Deleting a recently created file
Replacing files
Creating a window
Running batch commands
Creating a process with a hidden window
Unauthorized injection to a recently created process
Unauthorized injection to a recently created process by context flags manipulation
Launching a tool to kill processes
Enabling autorun by creating a file
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.
Result
Threat name:
Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/707565
Signature
Creates an undocumented autostart registry key
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 dropped file
Multi AV Scanner detection for submitted file
Posts data to a JPG file (protocol mismatch)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Crypto Currency Wallets
Writes to foreign memory regions
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 402701 Sample: 015f45de_by_Libranalysis Startdate: 03/05/2021 Architecture: WINDOWS Score: 100 48 Found malware configuration 2->48 50 Multi AV Scanner detection for dropped file 2->50 52 Multi AV Scanner detection for submitted file 2->52 54 4 other signatures 2->54 8 015f45de_by_Libranalysis.exe 15 8 2->8         started        process3 dnsIp4 42 launcher.worldofwarcraft.com 137.221.106.103, 49711, 80 BLIZZARDEU United Kingdom 8->42 26 C:\Users\user\AppData\Roaming\...\notpad.exe, PE32 8->26 dropped 28 C:\Users\...\015f45de_by_Libranalysis.exe, PE32 8->28 dropped 30 015f45de_by_Libran...exe:Zone.Identifier, ASCII 8->30 dropped 32 C:\Users\...\015f45de_by_Libranalysis.exe.log, ASCII 8->32 dropped 56 Creates an undocumented autostart registry key 8->56 58 Writes to foreign memory regions 8->58 60 Injects a PE file into a foreign processes 8->60 13 015f45de_by_Libranalysis.exe 193 8->13         started        18 015f45de_by_Libranalysis.exe 8->18         started        file5 signatures6 process7 dnsIp8 44 205.185.120.57, 49725, 80 PONYNETUS United States 13->44 46 192.168.2.1 unknown unknown 13->46 34 C:\ProgramData\vcruntime140.dll, PE32 13->34 dropped 36 C:\ProgramData\sqlite3.dll, PE32 13->36 dropped 38 C:\ProgramData\softokn3.dll, PE32 13->38 dropped 40 4 other files (none is malicious) 13->40 dropped 62 Tries to harvest and steal browser information (history, passwords, etc) 13->62 64 Tries to steal Crypto Currency Wallets 13->64 20 cmd.exe 1 13->20         started        66 Multi AV Scanner detection for dropped file 18->66 file9 signatures10 process11 process12 22 taskkill.exe 1 20->22         started        24 conhost.exe 20->24         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/916bd03b40de6bfa498311e3a70d3e98c50e8255fd413d446daab77951224856/
Threat name:
Win32.Trojan.Generic
Create hunting rule
Status:
Suspicious
First seen:
2021-05-03 09:34:55 UTC
AV detection:
12 of 47 (25.53%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=sfv5ao2a3zv7usmdchr2odj6tdcq5asv7vat2rdnvk3xsujcjbla._file
Verdict:
malicious
Similar samples:
1860347130f68ba0d084750816ca0fc532b8647d89e36ff53c0355e73a46d332
OskiStealer
37f96df377557cad9bdb2caa4064bbf4dd862e935a64e1d802d445358695e15c
OskiStealer
3aeccf51ec935646a4987a1683d5dd8a251d171d326041282759753e371dff4f
OskiStealer
604e8bce3d31f5e04fe9622cedeb0696a69b9cb7f262a9bb33009ede20df100a
OskiStealer
9b26547086a1489e5534452021694af3a565fe76926e671112be4852947a5d27
OskiStealer
9db40f7f060e08b2891dc881c6f6d1ea165b56747b4302fd96e53d8bd194d8d5
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a5c9be9bcb214e69a39285a634f95e43fdf1ad10536bcc9bce84be7edb48cb31
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b2454961c84e927b086719e0bae8016bee823e17402fb0feca8bda4e63ff009c
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cb24694242c1c1618678711184ab8abe6a1335d348f3549d2b568d99f793bf28
OskiStealer
db127ccf5ea69c0bc3888efe5ae2a532c5f5590a2f589f049139fcf63f5e8062
OskiStealer
+ 1'090 additional samples on MalwareBazaar
Result
Malware family:
oski
Create hunting rule
Score:
  10/10
Tags:
family:oski discovery infostealer spyware stealer
Link:
https://tria.ge/reports/210503-ycwkp44jzn/
Behaviour
Checks processor information in registry
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
Deletes itself
Loads dropped DLL
Reads user/profile data of web browsers
Downloads MZ/PE file
Oski
Unpacked files
SH256 hash:
32f37430bc3733f6eadcdbbd5afe2acd21a2d65c3671dcf09b2adb1d62214549
MD5 hash:
30312fb17a5f0a3c958a5bf014b96187
SHA1 hash:
81ad1d2b03121e9d034756018433c165d0712737
Link:
https://www.unpac.me/results/f488acce-119c-4b66-886f-ba4a8e759d75/
SH256 hash:
319d8b68a44235f0e6391d9386a92cdf5370f03f3d37c1b14ac8619e990e3a6b
MD5 hash:
122f5b1117a43c22e2161ca958a4a35c
SHA1 hash:
333ac7e317545acb12bb2b3d380d97cda6a3d33d
Link:
https://www.unpac.me/results/f488acce-119c-4b66-886f-ba4a8e759d75/
SH256 hash:
fc5da7e67cc4a77fc94a814cdde8b7c2705cf1fd09addfe91ee204647275538f
MD5 hash:
b188c5edfad98e6d1039796e8b988caf
SHA1 hash:
19b6c0b32f5add2f51645a8df94d1dc672e7c952
Detections:
win_oski_g0
Create hunting rule
win_oski_auto
Create hunting rule
Link:
https://www.unpac.me/results/f488acce-119c-4b66-886f-ba4a8e759d75/
Parent samples :
d8b500427918db815fb5b55eb807c8830192ea1ccd676d4a17155f4d10a1c36e
916bd03b40de6bfa498311e3a70d3e98c50e8255fd413d446daab77951224856
6bbdcec0763847706f9b75674aad231ff23afd2b212138fc630a86f69f8180d8
SH256 hash:
916bd03b40de6bfa498311e3a70d3e98c50e8255fd413d446daab77951224856
MD5 hash:
015f45de6bf81ded8c921435c471d087
SHA1 hash:
0ca33aaffac24eb52da8670bb617642d78bd46ab
Link:
https://www.unpac.me/results/f488acce-119c-4b66-886f-ba4a8e759d75/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Trojan
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/916bd03b40de6bfa498311e3a70d3e98c50e8255fd413d446daab77951224856

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:dsc
Create hunting rule
Author:Aaron DeVera
Description:Discord domains
Rule name:INDICATOR_KB_CERT_04f131322cc31d92c849fca351d2f141
Create hunting rule
Author:ditekSHen
Description:Detects executables signed with stolen, revoked or invalid certificates

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Web download

OskiStealer

Executable exe 916bd03b40de6bfa498311e3a70d3e98c50e8255fd413d446daab77951224856

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/1187851/
  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/148369/

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