MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 5ffe71b977866248e55612e20cea0bf3ad51a50896443d791081f58b49cdc5df. 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: 5ffe71b977866248e55612e20cea0bf3ad51a50896443d791081f58b49cdc5df
SHA3-384 hash: fca41ac3a376757db30982b26bc2a8582ece2b5c7c0857405f99720040c3fda3bc2fbf0d7b77394501f14d53fe29493f
SHA1 hash: 658e9df44920828b6bf73aad814f885efbb63cef
MD5 hash: 2269f021d855a0d6a65e7167962a23b0
humanhash: potato-high-sink-kilo
File name:MT100098764.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:529'920 bytes
First seen:2021-09-01 01:16:48 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'748 x AgentTesla, 19'642 x Formbook, 12'245 x SnakeKeylogger)
ssdeep 12288:tQjmz9MLzFgBMXViyUGQn7K+AdbNMFgxyj/9n37oNo8PTjZ9s:tR9Md2kQ7xABxypI
Threatray 3'296 similar samples on MalwareBazaar
TLSH T1A7B4D0997740B1EFC52BCD7689A81C24A661B47B930FE347985316AC9D0E6ABCF110F3
Reporter GovCERT_CH
Tags:exe OskiStealer

Intelligence

File Origin
# of uploads :
1
# of downloads :
171
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
MT100098764.exe
Verdict:
Malicious activity
Analysis date:
2021-09-01 01:18:09 UTC
Tags:
trojan stealer vidar loader
Link:
https://app.any.run/tasks/c69bfd96-284b-46d3-b5f4-41e8722eb5bc

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/184326/
Detection(s):
SecuriteInfo.com.Suspicious.Win32.Save.a.22229.24979.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Sending a UDP request
Launching a process
Creating a file
DNS request
Connection attempt
Deleting a recently created file
Reading critical registry keys
Replacing files
Delayed writing of the file
Running batch commands
Creating a process with a hidden window
Stealing user critical data
Launching a tool to kill processes
Unauthorized injection to a system process
Malware family:
Oski Stealer
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/dc4d7263-026a-48f4-950b-727ce46a1ef0
Result
Threat name:
Oski Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/843036
Signature
DLL side loading technique 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)
Machine Learning detection for sample
Multi AV Scanner detection for submitted file
Posts data to a JPG file (protocol mismatch)
Sigma detected: Suspicious Process Start Without DLL
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
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 475467 Sample: MT100098764.exe Startdate: 01/09/2021 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 MT100098764.exe 3 2->8         started        process3 file4 24 C:\Users\user\AppData\...\MT100098764.exe.log, ASCII 8->24 dropped 11 RegSvcs.exe 196 8->11         started        16 RegSvcs.exe 8->16         started        process5 dnsIp6 34 bctpump.us 162.241.123.16, 49681, 80 UNIFIEDLAYER-AS-1US United States 11->34 26 C:\ProgramData\sqlite3.dll, PE32 11->26 dropped 28 C:\ProgramData\vcruntime140.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 DLL side loading technique detected 11->46 48 Tries to steal Crypto Currency Wallets 11->48 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/5ffe71b977866248e55612e20cea0bf3ad51a50896443d791081f58b49cdc5df/
Threat name:
Win32.Trojan.Sabsik
Create hunting rule
Status:
Malicious
First seen:
2021-09-01 00:37:59 UTC
AV detection:
15 of 45 (33.33%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=l77hdolxqzrerzkwclraz2ql6owvdjiiszcd26iqqh2ywsonyxpq._file
Verdict:
malicious
Similar samples:
06c8a1e6544aede327bad32a5732d5bcfff143da73da01d34938efbe917e3289
OskiStealer
223dfd54929007ac23d6a20dbcf81a519a14f1c4061d23afcb761b75796042d2
OskiStealer
42c682af79cf1b73127ebf00349a8c4cabccdf42d2e14f77cda67121f870d8bf
OskiStealer
43460a1724b2521dd5e97c68c16edfce9caf22d49452efd956a64db91b5935a7
OskiStealer
44aa270e4c081241057bad8c1d0ea5864087325f8e3209aa10747f108123f718
OskiStealer
60d1297adb502d942493a794945336aea891d2c321476ef3349ac07726fca7c3
OskiStealer
83e8782266edec54f4c451f60e2095864c8a9d817e7296076e128c686a6bfea3
OskiStealer
a03b45dabcaf812402454befd876b2eafbdf9e967f3bb01e66f33f3cabbdebd5
OskiStealer
c254079e9a75cb708e28deb9c72c77689c53425f8256338343c06285bed8ebbe
OskiStealer
+ 3'286 additional samples on MalwareBazaar
Result
Malware family:
oski
Create hunting rule
Score:
  10/10
Tags:
family:oski infostealer spyware suricata
Link:
https://tria.ge/reports/210901-7bttv3cef6/
Behaviour
Checks processor information in registry
Kills process with taskkill
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Suspicious use of SetThreadContext
Accesses cryptocurrency files/wallets, possible credential harvesting
Loads dropped DLL
Downloads MZ/PE file
Oski
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
Malware Config
C2 Extraction:
http://bctpump.us
Unpacked files
SH256 hash:
8e03f35b69cfaa3dd1969957d7947c91e56df9670ea6a5db5975c3376d359ee0
MD5 hash:
87017c5617759bca27207d528697bdc3
SHA1 hash:
919a1a153ab4b6d1b42a934e1b9741daa15db268
Detections:
win_oski_g0
Create hunting rule
win_oski_auto
Create hunting rule
Link:
https://www.unpac.me/results/0d36ec76-413b-40f6-ba6b-aef6b372c152/
Parent samples :
7d12860910f95752bab43166470d3ac6dd1b8be3599bae2fca48aa1d01d1034a
5ffe71b977866248e55612e20cea0bf3ad51a50896443d791081f58b49cdc5df
2ca6487650676dfac02da8af32d2eea7c0a2162ff5c9881c54f698beac6921c4
091fb99d751df7e9e867422f401ff7181adc35c6f90ad2c8aafd54e3ec724771
21ac6486349c780cc40e9ab611d1e918a2919ba01d360572534c1da745b338a6
SH256 hash:
81f9eac76804c02f5baaa34c91b5775f965a34ad7811218d9c24e50cb6d9a90c
MD5 hash:
bae511742374b721136acaa03b0c1fa0
SHA1 hash:
215c50455b01a78ea173bbb034ddbe4b452ea734
Link:
https://www.unpac.me/results/0d36ec76-413b-40f6-ba6b-aef6b372c152/
SH256 hash:
16640bfc047e38da485e600078a7a4e4e803634ce17e8bf8db1e424c7e429b52
MD5 hash:
bfad0cf17a2872535b8786aaa1db4b8e
SHA1 hash:
1289641d024eb092ba3d5c313bd7187b1e8c4bc3
Link:
https://www.unpac.me/results/0d36ec76-413b-40f6-ba6b-aef6b372c152/
SH256 hash:
5ffe71b977866248e55612e20cea0bf3ad51a50896443d791081f58b49cdc5df
MD5 hash:
2269f021d855a0d6a65e7167962a23b0
SHA1 hash:
658e9df44920828b6bf73aad814f885efbb63cef
Link:
https://www.unpac.me/results/0d36ec76-413b-40f6-ba6b-aef6b372c152/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/5ffe71b97786/report/overview.html
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/5ffe71b977866248e55612e20cea0bf3ad51a50896443d791081f58b49cdc5df

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 5ffe71b977866248e55612e20cea0bf3ad51a50896443d791081f58b49cdc5df

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/184326/

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