MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 f5abfba489bfcef9819f0ca20cd54efc779d6091f6462b6083c363636739f41b. 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: f5abfba489bfcef9819f0ca20cd54efc779d6091f6462b6083c363636739f41b
SHA3-384 hash: cc9c44bd525f032333ce39c090480b3ec7cac03ba2103062ece6aa8eb5aa2a44485ad20b4708533c14950794962775d3
SHA1 hash: 46d38208bc64db83dc306d05870675f3b4208389
MD5 hash: 8c7c82469de5aacc1025699b79718847
humanhash: ack-tennessee-timing-washington
File name:Dubia Order_PO74555.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:1'025'536 bytes
First seen:2021-08-17 09:17:05 UTC
Last seen:2021-08-17 13:06:03 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'741 x AgentTesla, 19'606 x Formbook, 12'242 x SnakeKeylogger)
ssdeep 12288:3d5HEJbjJEKY+WddGJHbhfqO+sGxVgtdsTe6czZuGmSsPJcEljysDc9F3nC0Py3x:9Nm9rZP6MQ/Rq
Threatray 2'629 similar samples on MalwareBazaar
TLSH T10B2581391B7826A7D065D63EABD18613F04096DF3411AA5764CA0FA7B302AD2F7C723D
Reporter GovCERT_CH
Tags:exe OskiStealer

Intelligence

File Origin
# of uploads :
2
# of downloads :
135
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Dubia Order_PO74555.exe
Verdict:
Malicious activity
Analysis date:
2021-08-17 09:24:55 UTC
Tags:
trojan stealer vidar loader phishing
Link:
https://app.any.run/tasks/b394e441-b2de-4226-a22d-e4274f378773

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/179906/
Detection(s):
SecuriteInfo.com.Trojan.PackedNET.998-1.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Sending a UDP request
Launching the default Windows debugger (dwwin.exe)
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/94410bb1-0cef-4065-9506-be0d83c660d6
Result
Threat name:
Oski
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/834213
Signature
Downloads files with wrong headers with respect to MIME Content-Type
Found malware configuration
Found many strings related to Crypto-Wallets (likely being stolen)
Initial sample is a PE file and has a suspicious name
Machine Learning detection for sample
Multi AV Scanner detection for submitted file
Performs DNS queries to domains with low reputation
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
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 466644 Sample: Dubia Order_PO74555.exe Startdate: 17/08/2021 Architecture: WINDOWS Score: 100 36 Found malware configuration 2->36 38 Multi AV Scanner detection for submitted file 2->38 40 Yara detected Oski Stealer 2->40 42 8 other signatures 2->42 8 Dubia Order_PO74555.exe 3 2->8         started        process3 file4 24 C:\Users\user\...\Dubia Order_PO74555.exe.log, ASCII 8->24 dropped 11 Dubia Order_PO74555.exe 193 8->11         started        16 Dubia Order_PO74555.exe 8->16         started        process5 dnsIp6 34 kckark.xyz 172.67.203.175, 49726, 80 CLOUDFLARENETUS United States 11->34 26 C:\ProgramData\vcruntime140.dll, PE32 11->26 dropped 28 C:\ProgramData\sqlite3.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 Tries to steal Crypto Currency Wallets 11->46 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/f5abfba489bfcef9819f0ca20cd54efc779d6091f6462b6083c363636739f41b/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2021-08-17 08:26:30 UTC
AV detection:
11 of 45 (24.44%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=6wv7xjejx7hptam7bsrazvko7r3z2yer6zdcwyedynrwgzzz6qnq._file
Verdict:
malicious
Similar samples:
10410848d808e42758883ff2045ac5b10d16ad3d4155771483f0aba1f245a6e4
OskiStealer
223dfd54929007ac23d6a20dbcf81a519a14f1c4061d23afcb761b75796042d2
OskiStealer
42c682af79cf1b73127ebf00349a8c4cabccdf42d2e14f77cda67121f870d8bf
OskiStealer
43460a1724b2521dd5e97c68c16edfce9caf22d49452efd956a64db91b5935a7
OskiStealer
44aa270e4c081241057bad8c1d0ea5864087325f8e3209aa10747f108123f718
OskiStealer
60d1297adb502d942493a794945336aea891d2c321476ef3349ac07726fca7c3
OskiStealer
a03b45dabcaf812402454befd876b2eafbdf9e967f3bb01e66f33f3cabbdebd5
OskiStealer
a34e7c63da647c394b8becde55d6e87bc34e2c934c89b7f23484747a3598fb4c
OskiStealer
c254079e9a75cb708e28deb9c72c77689c53425f8256338343c06285bed8ebbe
OskiStealer
+ 2'619 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/210817-w1fgf72l1a/
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
Loads dropped DLL
Reads user/profile data of web browsers
Downloads MZ/PE file
Oski
Malware Config
C2 Extraction:
kckark.xyz
Unpacked files
SH256 hash:
6912e4bedd1288f116e968f0a79d9797f6d6bd24d45a5f10c52e20f9d33b8c61
MD5 hash:
03bde4a82ad64c0f314985232fbca3fa
SHA1 hash:
e8d0b6339e94192eaaca32c812f914e60576dca6
Link:
https://www.unpac.me/results/65843833-755a-4cdb-898e-38dfe6f127a1/
SH256 hash:
f627dc3b869d2e6cdbae8384fd2a8b6a0f09a678dc95306f38f32614be6d6856
MD5 hash:
192515ef7d44c00aebbc7e4802c43a86
SHA1 hash:
6fb2671bb37fc9e7cd49e564be88dd92ef956acf
Detections:
win_oski_g0
Create hunting rule
win_oski_auto
Create hunting rule
Link:
https://www.unpac.me/results/65843833-755a-4cdb-898e-38dfe6f127a1/
Parent samples :
242acd2bd4415b211de8afd058570aac478e1c257d31e908a2823b8fb3788ede
06c8a1e6544aede327bad32a5732d5bcfff143da73da01d34938efbe917e3289
fd16c60e634e807f6bbb7c3e6e12a4231b7b34851eb98d6da2f178b6125c536f
f5abfba489bfcef9819f0ca20cd54efc779d6091f6462b6083c363636739f41b
SH256 hash:
1624cb6c966c88dd621159ff8bde8f04c7d121d1bcd7d15e77a5bd8cb1733662
MD5 hash:
c2ddc8f13bc07d72af10679b92332506
SHA1 hash:
02a5ff3adc40936d9bfe3be9693a1560f90c998f
Link:
https://www.unpac.me/results/65843833-755a-4cdb-898e-38dfe6f127a1/
SH256 hash:
f5abfba489bfcef9819f0ca20cd54efc779d6091f6462b6083c363636739f41b
MD5 hash:
8c7c82469de5aacc1025699b79718847
SHA1 hash:
46d38208bc64db83dc306d05870675f3b4208389
Link:
https://www.unpac.me/results/65843833-755a-4cdb-898e-38dfe6f127a1/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/f5abfba489bf/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.61
Link:
https://yomi.yoroi.company/submissions/f5abfba489bfcef9819f0ca20cd54efc779d6091f6462b6083c363636739f41b

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 f5abfba489bfcef9819f0ca20cd54efc779d6091f6462b6083c363636739f41b

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/179906/

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