MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 5f55898f4f260025ec6507f92ed128dcd90f5f83d14b507282352f4c79fb71bc. 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: 8


Intelligence 8 IOCs 7 YARA 5 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 5f55898f4f260025ec6507f92ed128dcd90f5f83d14b507282352f4c79fb71bc
SHA3-384 hash: aa8705cc3cc718ab3ad350b9aa3b079f4c06ff36a7acdacec38a5e8195270d727f2d294ce0ef5232d3f3261ce0d46acb
SHA1 hash: a278ea762a0ade0c58ad49e9aa15075ef61e592c
MD5 hash: 8ff3cd20c7ca5a373dc7b988e2668bb5
humanhash: equal-london-potato-nine
File name:IMG053110579.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:269'624 bytes
First seen:2021-05-07 06:00:07 UTC
Last seen:2021-05-07 07:02:28 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'663 x AgentTesla, 19'478 x Formbook, 12'208 x SnakeKeylogger)
ssdeep 6144:fIEATjJTVGetfUeAIQHuA36cd0soxQ8BRAn4WjSUw+67pOEB:fIEAhTVGeeeAItC66o/An4Wj5w+WA
Threatray 1'140 similar samples on MalwareBazaar
TLSH 694402045BC4CB0DC9320D72BEB6D230BA61AF41AD61D5A77913F26E4770B84D869F2A
Reporter abuse_ch
Tags:exe OskiStealer


Avatar
abuse_ch
OskiStealer C2:
http://209.141.40.19/6.jpg

Indicators Of Compromise (IOCs)

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

IOCThreatFox Reference
http://209.141.40.19/6.jpg https://threatfox.abuse.ch/ioc/30103/
http://209.141.40.19/1.jpg https://threatfox.abuse.ch/ioc/30104/
http://209.141.40.19/2.jpg https://threatfox.abuse.ch/ioc/30105/
http://209.141.40.19/3.jpg https://threatfox.abuse.ch/ioc/30106/
http://209.141.40.19/4.jpg https://threatfox.abuse.ch/ioc/30107/
http://209.141.40.19/5.jpg https://threatfox.abuse.ch/ioc/30108/
http://209.141.40.19/7.jpg https://threatfox.abuse.ch/ioc/30109/

Intelligence

File Origin
# of uploads :
3
# of downloads :
127
Origin country :
n/a
Vendor Threat Intelligence
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/152440/
Detection(s):
SecuriteInfo.com.Mal.Generic-S.3383.15472.UNOFFICIAL
Create hunting rule

Result
Verdict:
Clean
Maliciousness:
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 Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/715717
Signature
Allocates memory in foreign processes
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
Machine Learning detection for dropped file
Machine Learning detection for sample
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 Oski Stealer
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 406794 Sample: IMG053110579.exe Startdate: 07/05/2021 Architecture: WINDOWS Score: 100 41 Found malware configuration 2->41 43 Multi AV Scanner detection for dropped file 2->43 45 Multi AV Scanner detection for submitted file 2->45 47 7 other signatures 2->47 8 IMG053110579.exe 29 2->8         started        process3 file4 23 C:\Users\user\AppData\Roaming\...\notpad.exe, PE32 8->23 dropped 25 C:\Users\user\AppData\...\IMG053110579.exe, PE32 8->25 dropped 27 C:\Users\user\...\notpad.exe:Zone.Identifier, ASCII 8->27 dropped 29 2 other malicious files 8->29 dropped 49 Creates an undocumented autostart registry key 8->49 51 Writes to foreign memory regions 8->51 53 Allocates memory in foreign processes 8->53 55 Injects a PE file into a foreign processes 8->55 12 IMG053110579.exe 193 8->12         started        signatures5 process6 dnsIp7 39 209.141.40.19, 49726, 80 PONYNETUS United States 12->39 31 C:\ProgramData\vcruntime140.dll, PE32 12->31 dropped 33 C:\ProgramData\sqlite3.dll, PE32 12->33 dropped 35 C:\ProgramData\softokn3.dll, PE32 12->35 dropped 37 4 other files (none is malicious) 12->37 dropped 57 Multi AV Scanner detection for dropped file 12->57 59 Machine Learning detection for dropped file 12->59 61 Tries to harvest and steal browser information (history, passwords, etc) 12->61 63 Tries to steal Crypto Currency Wallets 12->63 17 cmd.exe 1 12->17         started        file8 signatures9 process10 process11 19 taskkill.exe 1 17->19         started        21 conhost.exe 17->21         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/5f55898f4f260025ec6507f92ed128dcd90f5f83d14b507282352f4c79fb71bc/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2021-05-07 06:00:23 UTC
AV detection:
17 of 47 (36.17%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=l5kytd2peyacl3dfa74s5uji3tmq6x4d2ffva4ucguxuy6p3og6a._file
Verdict:
malicious
Similar samples:
0768e83e8d36f21ea90867dcf3935ee48795daf2e4a0017979e752b865c95d9e
OskiStealer
1860347130f68ba0d084750816ca0fc532b8647d89e36ff53c0355e73a46d332
OskiStealer
25372a9d5205bae496a358c0d33c9f4f9a6e4f3daa00e693cc1df5721c8227fb
OskiStealer
37f96df377557cad9bdb2caa4064bbf4dd862e935a64e1d802d445358695e15c
OskiStealer
3aeccf51ec935646a4987a1683d5dd8a251d171d326041282759753e371dff4f
OskiStealer
604e8bce3d31f5e04fe9622cedeb0696a69b9cb7f262a9bb33009ede20df100a
OskiStealer
916bd03b40de6bfa498311e3a70d3e98c50e8255fd413d446daab77951224856
OskiStealer
9b26547086a1489e5534452021694af3a565fe76926e671112be4852947a5d27
OskiStealer
cb24694242c1c1618678711184ab8abe6a1335d348f3549d2b568d99f793bf28
OskiStealer
db127ccf5ea69c0bc3888efe5ae2a532c5f5590a2f589f049139fcf63f5e8062
OskiStealer
+ 1'130 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/210507-rfjz35a3j2/
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
Malware Config
C2 Extraction:
209.141.40.19
Unpacked files
SH256 hash:
5d9d3c42d110259d1390fdd23aaf943f20397f4e905b564390cc400a15473ca0
MD5 hash:
3b1be6ac2d62fe8ccec8c34c515f06af
SHA1 hash:
8bccff1ad767d1959527dbdfe10e161bb4cbd595
Link:
https://www.unpac.me/results/523d9bc3-1fec-4b43-b901-9b512ac5c4d7/
SH256 hash:
022ac9043d25d99ac355d63c096d263a50d047c7658f69033bcdb20a9f87b604
MD5 hash:
f63a0712ea8b014d08e1cbdb3d784fb5
SHA1 hash:
82fa14b869c1fbf5a1f61e51bd114c251a262741
Link:
https://www.unpac.me/results/523d9bc3-1fec-4b43-b901-9b512ac5c4d7/
SH256 hash:
c27e09112c0c543b5f0876347765a374d0a7c89fe6f8d490013d07d8b68753c1
MD5 hash:
bb43c9f517c5d01bf0a3205f08cdd493
SHA1 hash:
51ab35727f745c63a6b0d802712768983316503d
Detections:
win_oski_g0
Create hunting rule
win_oski_auto
Create hunting rule
Link:
https://www.unpac.me/results/523d9bc3-1fec-4b43-b901-9b512ac5c4d7/
Parent samples :
76a5f8550442958458b6bdb42625ceda1380548e9bcd8200e584f3c486de96ed
5f55898f4f260025ec6507f92ed128dcd90f5f83d14b507282352f4c79fb71bc
afdbf26cb55fb5d7acb13eee328ced4ffd4fd1d42a72dc95fb1053b264ec45ee
SH256 hash:
5f55898f4f260025ec6507f92ed128dcd90f5f83d14b507282352f4c79fb71bc
MD5 hash:
8ff3cd20c7ca5a373dc7b988e2668bb5
SHA1 hash:
a278ea762a0ade0c58ad49e9aa15075ef61e592c
Link:
https://www.unpac.me/results/523d9bc3-1fec-4b43-b901-9b512ac5c4d7/
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/5f55898f4f260025ec6507f92ed128dcd90f5f83d14b507282352f4c79fb71bc

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_EXE_Packed_SmartAssembly
Create hunting rule
Author:ditekSHen
Description:Detects executables packed with SmartAssembly
Rule name:INDICATOR_KB_CERT_04f131322cc31d92c849fca351d2f141
Create hunting rule
Author:ditekSHen
Description:Detects executables signed with stolen, revoked or invalid certificates
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.

Web download

OskiStealer

Executable exe 5f55898f4f260025ec6507f92ed128dcd90f5f83d14b507282352f4c79fb71bc

(this sample)

Cape
Cape
https://www.capesandbox.com/analysis/152440/
  
URLhaus
https://urlhaus.abuse.ch/url/1203556/
  
Delivery method
Distributed via web download

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