MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a3ef4500e9f5f2447d55de102e2529a62b48f644b03d22199ce5c69c0ca57c88. 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 7 YARA 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: a3ef4500e9f5f2447d55de102e2529a62b48f644b03d22199ce5c69c0ca57c88
SHA3-384 hash: 407fb9b27e3f19b9fd7f7d9b971be64d65bde0704df343567419331a429f52646c574bd0c09e9efbb831dc3f5b76fcba
SHA1 hash: c39c80b549f7dc46bfe18d5b956a4a17b28bac78
MD5 hash: 1fc85b87347785b556af1d0f47a1f928
humanhash: oklahoma-illinois-island-low
File name:proforma invoice No. 42037,pdf.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:32'256 bytes
First seen:2021-05-05 10:10:10 UTC
Last seen:2021-05-05 11:17:51 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'666 x AgentTesla, 19'479 x Formbook, 12'209 x SnakeKeylogger)
ssdeep 192:v340Z49N9VMkG9YtsHw7P+zwTZOjA3/DYXM:v3529N9VK99W+zwTZOjA3bY
Threatray 1'106 similar samples on MalwareBazaar
TLSH 5AE2B968BF89437BDCBD4FB426A202521B74F9B668779A0F79F04809DD17287BD03610
Reporter abuse_ch
Tags:exe OskiStealer


Avatar
abuse_ch
OskiStealer C2:
http://203.159.80.72/6.jpg

Indicators Of Compromise (IOCs)

Below is a list of indicators of compromise (IOCs) associated with this malware samples.

IOCThreatFox Reference
http://203.159.80.72/6.jpg https://threatfox.abuse.ch/ioc/28994/
http://203.159.80.72/1.jpg https://threatfox.abuse.ch/ioc/28995/
http://203.159.80.72/2.jpg https://threatfox.abuse.ch/ioc/28996/
http://203.159.80.72/3.jpg https://threatfox.abuse.ch/ioc/28997/
http://203.159.80.72/4.jpg https://threatfox.abuse.ch/ioc/28998/
http://203.159.80.72/5.jpg https://threatfox.abuse.ch/ioc/28999/
http://203.159.80.72/7.jpg https://threatfox.abuse.ch/ioc/29000/

Intelligence

File Origin
# of uploads :
3
# of downloads :
89
Origin country :
n/a
Vendor Threat Intelligence
Detection:
Vidar
Create hunting rule
Link:
https://www.capesandbox.com/analysis/150386/
Detection(s):
SecuriteInfo.com.generic.ml.19816.28939.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
DNS request
Sending a custom TCP request
Creating a file
Sending a UDP request
Deleting a recently created file
Reading critical registry keys
Replacing files
Creating a window
Delayed writing of the file
Sending an HTTP GET request
Changing the Zone.Identifier stream
Creating a process from a recently created file
Creating a process with a hidden window
Running batch commands
Using the Windows Management Instrumentation requests
Searching for the window
Unauthorized injection to a recently created process
Stealing user critical data
Unauthorized injection to a recently created process by context flags manipulation
Launching a tool to kill processes
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/f424d057-7c5d-4154-b268-c8c9a0233502
Result
Threat name:
Snake Keylogger Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/711828
Signature
Creates files in alternative data streams (ADS)
DLL reload attack 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
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
Machine Learning detection for sample
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 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 Beds Obfuscator
Yara detected Snake Keylogger
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 404838 Sample: proforma invoice No. 42037,... Startdate: 05/05/2021 Architecture: WINDOWS Score: 100 60 Found malware configuration 2->60 62 Multi AV Scanner detection for submitted file 2->62 64 DLL reload attack detected 2->64 66 10 other signatures 2->66 8 proforma invoice No. 42037,pdf.exe 15 3 2->8         started        process3 dnsIp4 46 cdn.discordapp.com 162.159.135.233, 443, 49717 CLOUDFLARENETUS United States 8->46 32 C:\...\proforma invoice No. 42037,pdf.exe.log, ASCII 8->32 dropped 80 Injects a PE file into a foreign processes 8->80 13 proforma invoice No. 42037,pdf.exe 202 8->13         started        file5 signatures6 process7 dnsIp8 54 203.159.80.72, 49719, 80 LOVESERVERSGB Netherlands 13->54 56 162.159.133.233, 443, 49725, 49727 CLOUDFLARENETUS United States 13->56 58 cdn.discordapp.com 13->58 34 C:\Users\user\AppData\...\Log_snake[1].exe, PE32 13->34 dropped 36 C:\ProgramData\990117081222.exe, PE32 13->36 dropped 38 C:\...\990117081222.exe:Zone.Identifier, ASCII 13->38 dropped 40 7 other files (none is malicious) 13->40 dropped 82 Creates files in alternative data streams (ADS) 13->82 84 Tries to harvest and steal browser information (history, passwords, etc) 13->84 86 Tries to steal Crypto Currency Wallets 13->86 18 990117081222.exe 14 3 13->18         started        22 cmd.exe 1 13->22         started        file9 signatures10 process11 dnsIp12 42 162.159.129.233, 443, 49729 CLOUDFLARENETUS United States 18->42 44 cdn.discordapp.com 18->44 68 May check the online IP address of the machine 18->68 70 Machine Learning detection for dropped file 18->70 72 Injects a PE file into a foreign processes 18->72 24 990117081222.exe 2 18->24         started        28 taskkill.exe 1 22->28         started        30 conhost.exe 22->30         started        signatures13 process14 dnsIp15 48 checkip.dyndns.org 24->48 50 checkip.dyndns.com 162.88.193.70, 49733, 49734, 80 DYNDNSUS United States 24->50 52 freegeoip.app 104.21.19.200, 443, 49735 CLOUDFLARENETUS United States 24->52 74 Tries to steal Mail credentials (via file access) 24->74 76 Tries to harvest and steal ftp login credentials 24->76 78 Tries to harvest and steal browser information (history, passwords, etc) 24->78 signatures16
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/a3ef4500e9f5f2447d55de102e2529a62b48f644b03d22199ce5c69c0ca57c88/
Threat name:
ByteCode-MSIL.Trojan.Generic
Create hunting rule
Status:
Suspicious
First seen:
2021-05-05 08:36:30 UTC
AV detection:
13 of 29 (44.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=upxukahj6xzei7kv3yic4jjjuyvur5sewa6segm44xdjydffpsea._file
Verdict:
malicious
Similar samples:
1860347130f68ba0d084750816ca0fc532b8647d89e36ff53c0355e73a46d332
OskiStealer
2b3f661e6165b5a63130acb2509821a895f0eee94e7af31fdd6abd32db3ab687
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37f96df377557cad9bdb2caa4064bbf4dd862e935a64e1d802d445358695e15c
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3aeccf51ec935646a4987a1683d5dd8a251d171d326041282759753e371dff4f
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40afa1e323be151d0d7a38c72f771b0b9e909f49ddade942d4260a5e29e5ec2f
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604e8bce3d31f5e04fe9622cedeb0696a69b9cb7f262a9bb33009ede20df100a
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916bd03b40de6bfa498311e3a70d3e98c50e8255fd413d446daab77951224856
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9b26547086a1489e5534452021694af3a565fe76926e671112be4852947a5d27
OskiStealer
cb24694242c1c1618678711184ab8abe6a1335d348f3549d2b568d99f793bf28
OskiStealer
d217032899487162688fa6c3855e13040b074de38d9c57c91b47c1190842edc2
OskiStealer
+ 1'096 additional samples on MalwareBazaar
Result
Malware family:
snakekeylogger
Create hunting rule
Score:
  10/10
Tags:
family:oski family:snakekeylogger discovery infostealer keylogger spyware stealer
Link:
https://tria.ge/reports/210505-8c3gkqakp6/
Behaviour
Checks processor information in registry
Kills process with taskkill
NTFS ADS
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
Looks up external IP address via web service
Loads dropped DLL
Reads data files stored by FTP clients
Reads user/profile data of local email clients
Reads user/profile data of web browsers
Downloads MZ/PE file
Executes dropped EXE
Oski
Snake Keylogger
Snake Keylogger Payload
Malware Config
C2 Extraction:
https://api.telegram.org/bot1761516426:AAE3Juu_v6fG9Gy1S33LdTvyz85ua-duZsk/sendMessage?chat_id=1727399585
Unpacked files
SH256 hash:
a3ef4500e9f5f2447d55de102e2529a62b48f644b03d22199ce5c69c0ca57c88
MD5 hash:
1fc85b87347785b556af1d0f47a1f928
SHA1 hash:
c39c80b549f7dc46bfe18d5b956a4a17b28bac78
Link:
https://www.unpac.me/results/0f314ba4-80ac-4026-b0b6-d08aa2c966bd/
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/a3ef4500e9f5f2447d55de102e2529a62b48f644b03d22199ce5c69c0ca57c88

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

File information

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

Cape
Cape
https://www.capesandbox.com/analysis/150386/

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