MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 2b3f661e6165b5a63130acb2509821a895f0eee94e7af31fdd6abd32db3ab687. 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: 7


Intelligence 7 IOCs 7 YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 2b3f661e6165b5a63130acb2509821a895f0eee94e7af31fdd6abd32db3ab687
SHA3-384 hash: 22fdd9e98759ce2acc3c1f4a9e3f5efa0a802b6c64cdc44433c8df3b2f6c400b78d37ef90da5148a36383c6ffb59af1d
SHA1 hash: 83d47736d04939e1c01b3df7720109c6d5ca9f78
MD5 hash: f7565a4825eb92f2859114bb5a08b60d
humanhash: lithium-hot-robert-uranus
File name:Proforma adjunta Nº 42037,pdf.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:35'328 bytes
First seen:2021-05-04 15:36:05 UTC
Last seen:2021-05-04 17:03:05 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'652 x AgentTesla, 19'463 x Formbook, 12'204 x SnakeKeylogger)
ssdeep 384:oYgUrWYvQIMAsKTQcS4Q9gW+zwTZOjAnbz:oZUdmAsQI4QWW+zwTZOjAnbz
Threatray 1'105 similar samples on MalwareBazaar
TLSH 95F2C828BFC8836ADCAE4F7924F102510B34FAF66837DB4F69A0651EED532476D12760
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 :
2
# of downloads :
107
Origin country :
n/a
Vendor Threat Intelligence
Detection(s):
SecuriteInfo.com.ArtemisF7565A4825EB.28674.9271.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Using the Windows Management Instrumentation requests
Searching for the window
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 with a hidden window
Running batch commands
Creating a process from a recently created file
Unauthorized injection to a recently created process
Unauthorized injection to a recently created process by context flags manipulation
Stealing user critical data
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.
Result
Threat name:
Snake Keylogger
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/710352
Signature
Creates files in alternative data streams (ADS)
DLL reload attack detected
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
Machine Learning detection for dropped file
Machine Learning detection for sample
May check the online IP address of the machine
Posts data to a JPG file (protocol mismatch)
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
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
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 404097 Sample: Proforma adjunta N#U00ba 42... Startdate: 04/05/2021 Architecture: WINDOWS Score: 100 58 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->58 60 Found malware configuration 2->60 62 DLL reload attack detected 2->62 64 7 other signatures 2->64 8 Proforma adjunta N#U00ba 42037,pdf.exe 15 3 2->8         started        process3 dnsIp4 46 cdn.discordapp.com 162.159.133.233, 443, 49707, 49714 CLOUDFLARENETUS United States 8->46 32 Proforma adjunta N...a 42037,pdf.exe.log, ASCII 8->32 dropped 78 Injects a PE file into a foreign processes 8->78 13 Proforma adjunta N#U00ba 42037,pdf.exe 202 8->13         started        file5 signatures6 process7 dnsIp8 54 203.159.80.72, 49710, 80 LOVESERVERSGB Netherlands 13->54 56 cdn.discordapp.com 13->56 34 C:\Users\user\...\snake_crypted[1].exe, PE32 13->34 dropped 36 C:\ProgramData\399557834373.exe, PE32 13->36 dropped 38 C:\...\399557834373.exe:Zone.Identifier, ASCII 13->38 dropped 40 7 other files (none is malicious) 13->40 dropped 80 Creates files in alternative data streams (ADS) 13->80 82 Tries to harvest and steal browser information (history, passwords, etc) 13->82 84 Tries to steal Crypto Currency Wallets 13->84 18 399557834373.exe 14 3 13->18         started        22 cmd.exe 1 13->22         started        file9 signatures10 process11 dnsIp12 42 192.168.2.1 unknown unknown 18->42 44 cdn.discordapp.com 18->44 66 May check the online IP address of the machine 18->66 68 Machine Learning detection for dropped file 18->68 70 Injects a PE file into a foreign processes 18->70 24 399557834373.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 216.146.43.71, 49721, 49722, 80 DYNDNSUS United States 24->50 52 freegeoip.app 172.67.188.154, 443, 49725 CLOUDFLARENETUS United States 24->52 72 Tries to steal Mail credentials (via file access) 24->72 74 Tries to harvest and steal ftp login credentials 24->74 76 Tries to harvest and steal browser information (history, passwords, etc) 24->76 signatures16
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/2b3f661e6165b5a63130acb2509821a895f0eee94e7af31fdd6abd32db3ab687/
Threat name:
ByteCode-MSIL.Infostealer.Stelega
Create hunting rule
Status:
Malicious
First seen:
2021-05-04 15:36:12 UTC
AV detection:
11 of 29 (37.93%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=fm7wmhtbmw22mmjqvszfbgbbvck7b3xjjz5pgh65nk6tfwz2w2dq._file
Verdict:
malicious
Similar samples:
1860347130f68ba0d084750816ca0fc532b8647d89e36ff53c0355e73a46d332
OskiStealer
37f96df377557cad9bdb2caa4064bbf4dd862e935a64e1d802d445358695e15c
OskiStealer
3aeccf51ec935646a4987a1683d5dd8a251d171d326041282759753e371dff4f
OskiStealer
40afa1e323be151d0d7a38c72f771b0b9e909f49ddade942d4260a5e29e5ec2f
OskiStealer
604e8bce3d31f5e04fe9622cedeb0696a69b9cb7f262a9bb33009ede20df100a
OskiStealer
916bd03b40de6bfa498311e3a70d3e98c50e8255fd413d446daab77951224856
OskiStealer
9b26547086a1489e5534452021694af3a565fe76926e671112be4852947a5d27
OskiStealer
cb24694242c1c1618678711184ab8abe6a1335d348f3549d2b568d99f793bf28
OskiStealer
d217032899487162688fa6c3855e13040b074de38d9c57c91b47c1190842edc2
OskiStealer
db127ccf5ea69c0bc3888efe5ae2a532c5f5590a2f589f049139fcf63f5e8062
OskiStealer
+ 1'095 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/210504-qmn5fmmets/
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:
2b3f661e6165b5a63130acb2509821a895f0eee94e7af31fdd6abd32db3ab687
MD5 hash:
f7565a4825eb92f2859114bb5a08b60d
SHA1 hash:
83d47736d04939e1c01b3df7720109c6d5ca9f78
Link:
https://www.unpac.me/results/c86efb73-15ef-4229-9542-d5ef216e87b0/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.35
Link:
https://yomi.yoroi.company/submissions/2b3f661e6165b5a63130acb2509821a895f0eee94e7af31fdd6abd32db3ab687

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:MALWARE_Win_Vidar
Create hunting rule
Author:ditekSHen
Description:Detects Vidar / ArkeiStealer
Rule name:pe_imphash
Create hunting rule
Rule name:Vidar
Create hunting rule
Author:kevoreilly
Description:Vidar Payload
Rule name:win_oski_auto
Create hunting rule
Author:Felix Bilstein - yara-signator at cocacoding dot com
Description:autogenerated rule brought to you by yara-signator

File information

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

Comments