MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 bf4a95df4ed9665758637f1f29705fd954aaf5a4b9e4e5d89025ddb6f8331904. 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 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: bf4a95df4ed9665758637f1f29705fd954aaf5a4b9e4e5d89025ddb6f8331904
SHA3-384 hash: 2a5afe3e4fac0501518e5cf488977bbb87b2a00efb229fdb9904af485048133b25eac0074aa6e54d16720bb868494fe8
SHA1 hash: 5a3401a997298034b9302bb2ab2ab476ebe52dac
MD5 hash: 6d51e2e0f9b263e7d318c007c9c4f2c6
humanhash: bluebird-mars-south-arizona
File name:Waybill Document 22700456XX,pdf.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:561'664 bytes
First seen:2021-05-20 10:54:36 UTC
Last seen:2021-05-20 15:09:22 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'652 x AgentTesla, 19'463 x Formbook, 12'205 x SnakeKeylogger)
ssdeep 12288:HAQ5/iu846elcYYmEZqSW6M5MzTp/vb2eHKz:gYw+lN33SW6M56TpXqeqz
Threatray 1'213 similar samples on MalwareBazaar
TLSH 13C412201758A7ACF93F9B7CA014C01403F0A918A753DB2EBE1550AACD97B8F875DF92
Reporter lowmal3
Tags:OskiStealer

Intelligence

File Origin
# of uploads :
3
# of downloads :
110
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Waybill Document 22700456XX,pdf.exe
Verdict:
Malicious activity
Analysis date:
2021-05-20 11:01:10 UTC
Tags:
trojan stealer vidar loader
Link:
https://app.any.run/tasks/a28885a6-7db6-4a72-85a5-0ce4ebf4f7ff

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/159547/
Detection(s):
SecuriteInfo.com.Trojan.PackedNET.747-1.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Sending a custom TCP request
Sending a UDP request
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:
Oski Snake Keylogger Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/786085
Signature
.NET source code contains potential unpacker
Creates files in alternative data streams (ADS)
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
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
May check the online IP address of the machine
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 harvest and steal ftp login credentials
Tries to steal Crypto Currency Wallets
Tries to steal Mail credentials (via file access)
Yara detected AntiVM3
Yara detected Beds Obfuscator
Yara detected Oski Stealer
Yara detected Snake Keylogger
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 418481 Sample: Waybill Document 22700456XX... Startdate: 20/05/2021 Architecture: WINDOWS Score: 100 54 Found malware configuration 2->54 56 Multi AV Scanner detection for submitted file 2->56 58 Yara detected Snake Keylogger 2->58 60 11 other signatures 2->60 8 Waybill Document 22700456XX,pdf.exe 3 2->8         started        process3 file4 32 Waybill Document 22700456XX,pdf.exe.log, ASCII 8->32 dropped 68 Injects a PE file into a foreign processes 8->68 12 Waybill Document 22700456XX,pdf.exe 200 8->12         started        17 Waybill Document 22700456XX,pdf.exe 8->17         started        signatures5 process6 dnsIp7 48 45.133.1.223, 49719, 80 DEDIPATH-LLCUS Netherlands 12->48 50 www.almacigoschile.cl 12->50 52 almacigoschile.cl 190.107.177.247, 49724, 80 SOCCOMERCIALWIRENETCHILELTDACL Chile 12->52 34 C:\Users\user\...\FV1UeTZYsEEExG3[1].exe, PE32 12->34 dropped 36 C:\ProgramData\079328304621.exe, PE32 12->36 dropped 38 C:\...\079328304621.exe:Zone.Identifier, ASCII 12->38 dropped 40 7 other files (none is malicious) 12->40 dropped 76 Creates files in alternative data streams (ADS) 12->76 78 Tries to harvest and steal browser information (history, passwords, etc) 12->78 80 Tries to steal Crypto Currency Wallets 12->80 19 079328304621.exe 3 12->19         started        22 cmd.exe 1 12->22         started        file8 signatures9 process10 signatures11 62 May check the online IP address of the machine 19->62 64 Machine Learning detection for dropped file 19->64 66 Injects a PE file into a foreign processes 19->66 24 079328304621.exe 15 2 19->24         started        28 taskkill.exe 1 22->28         started        30 conhost.exe 22->30         started        process12 dnsIp13 42 checkip.dyndns.org 24->42 44 checkip.dyndns.com 216.146.43.71, 49727, 49728, 80 DYNDNSUS United States 24->44 46 freegeoip.app 172.67.188.154, 443, 49730 CLOUDFLARENETUS United States 24->46 70 Tries to steal Mail credentials (via file access) 24->70 72 Tries to harvest and steal ftp login credentials 24->72 74 Tries to harvest and steal browser information (history, passwords, etc) 24->74 signatures14
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/bf4a95df4ed9665758637f1f29705fd954aaf5a4b9e4e5d89025ddb6f8331904/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2021-05-20 10:55:15 UTC
AV detection:
16 of 29 (55.17%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=x5fjlx2o3ftfowddp4pss4c73fkkv5nexhsolweqexo3n6btdeca._file
Verdict:
malicious
Similar samples:
0768e83e8d36f21ea90867dcf3935ee48795daf2e4a0017979e752b865c95d9e
OskiStealer
1860347130f68ba0d084750816ca0fc532b8647d89e36ff53c0355e73a46d332
OskiStealer
25372a9d5205bae496a358c0d33c9f4f9a6e4f3daa00e693cc1df5721c8227fb
OskiStealer
37f96df377557cad9bdb2caa4064bbf4dd862e935a64e1d802d445358695e15c
OskiStealer
3aeccf51ec935646a4987a1683d5dd8a251d171d326041282759753e371dff4f
OskiStealer
604e8bce3d31f5e04fe9622cedeb0696a69b9cb7f262a9bb33009ede20df100a
OskiStealer
916bd03b40de6bfa498311e3a70d3e98c50e8255fd413d446daab77951224856
OskiStealer
9b26547086a1489e5534452021694af3a565fe76926e671112be4852947a5d27
OskiStealer
b2454961c84e927b086719e0bae8016bee823e17402fb0feca8bda4e63ff009c
OskiStealer
db127ccf5ea69c0bc3888efe5ae2a532c5f5590a2f589f049139fcf63f5e8062
OskiStealer
+ 1'203 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/210520-5rrpgaqtka/
Behaviour
Checks processor information in registry
Kills process with taskkill
NTFS ADS
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
Executes dropped EXE
Oski
Malware Config
C2 Extraction:
45.133.1.223
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
AgentTesla
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/bf4a95df4ed9665758637f1f29705fd954aaf5a4b9e4e5d89025ddb6f8331904

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:INDICATOR_SUSPICIOUS_Stomped_PECompilation_Timestamp_InTheFu
Create hunting rule
Author:ditekSHen
Description:Detect executables with stomped PE compilation timestamp that is greater than local current time
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 bf4a95df4ed9665758637f1f29705fd954aaf5a4b9e4e5d89025ddb6f8331904

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/159547/

Comments