MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c87ec3f9dfb87a10f1c38102a3c58bc2cbb252891b5c882f3c4f3f0a9058b170. 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 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: c87ec3f9dfb87a10f1c38102a3c58bc2cbb252891b5c882f3c4f3f0a9058b170
SHA3-384 hash: e5510b8daf854887ea0a57944c21b56e438ca6fb0b39de79b8fb61574e687e14dd2804085c19a5a357b66cdf3de2d642
SHA1 hash: 6686b9d64df9a2c31f61c5a6682b2d899ab1a599
MD5 hash: 02c69e67c2f23c547d0022147da9fbe9
humanhash: maine-north-fanta-freddie
File name:gunzipped.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:748'032 bytes
First seen:2022-07-27 15:05:47 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'742 x AgentTesla, 19'607 x Formbook, 12'242 x SnakeKeylogger)
ssdeep 12288:gTAGAyxKEIItneFj9IFdlf4x8cKteGo8Qi56BfkkuGcjID137VmeJavFGIsalDk3:gxyunewFdN4xnKR5Qcy3jDtZ4Hsayd
Threatray 4'582 similar samples on MalwareBazaar
TLSH T170F4E104B667CD17C1AC0773D0C2250547F99A47D2A7DB4B7AC843EA4E437E2A9863AF
TrID 61.5% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
11.0% (.SCR) Windows screen saver (13101/52/3)
8.8% (.EXE) Win64 Executable (generic) (10523/12/4)
5.5% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.2% (.EXE) Win16 NE executable (generic) (5038/12/1)
File icon (PE):PE icon
dhash icon 86738c8d86966992 (12 x AgentTesla, 6 x Loki, 6 x Formbook)
Reporter abuse_ch
Tags:exe OskiStealer


Avatar
abuse_ch
OskiStealer C2:
http://master101work.co/6.jpg

Indicators Of Compromise (IOCs)

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

IOCThreatFox Reference
http://master101work.co/6.jpg https://threatfox.abuse.ch/ioc/839823/
http://master101work.co/1.jpg https://threatfox.abuse.ch/ioc/839824/
http://master101work.co/2.jpg https://threatfox.abuse.ch/ioc/839825/
http://master101work.co/3.jpg https://threatfox.abuse.ch/ioc/839826/
http://master101work.co/4.jpg https://threatfox.abuse.ch/ioc/839827/
http://master101work.co/5.jpg https://threatfox.abuse.ch/ioc/839828/
http://master101work.co/7.jpg https://threatfox.abuse.ch/ioc/839829/

Intelligence

File Origin
# of uploads :
1
# of downloads :
380
Origin country :
n/a
Vendor Threat Intelligence
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/294672/
Detection(s):
SecuriteInfo.com.Trojan.PWS.Siggen3.20355.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Launching a process
Creating a process with a hidden window
Creating a file
Running batch commands
Launching a tool to kill processes
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
packed
Link:
https://www.filescan.io/uploads/62e155117dd0cb902f060573/reports/a1887f1b-bcd3-44b8-89d7-a90d52a3802b/overview
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/2f543792-841e-40d7-9e0d-d530e2028161
Result
Threat name:
Oski Stealer, Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1041925
Signature
.NET source code contains method to dynamically call methods (often used by packers)
Adds a directory exclusion to Windows Defender
C2 URLs / IPs found in malware configuration
Downloads files with wrong headers with respect to MIME Content-Type
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
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Posts data to a JPG file (protocol mismatch)
Snort IDS alert for network traffic
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
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected AntiVM3
Yara detected Oski Stealer
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 674419 Sample: gunzipped.exe Startdate: 27/07/2022 Architecture: WINDOWS Score: 100 49 Snort IDS alert for network traffic 2->49 51 Malicious sample detected (through community Yara rule) 2->51 53 Multi AV Scanner detection for dropped file 2->53 55 11 other signatures 2->55 8 gunzipped.exe 7 2->8         started        process3 file4 31 C:\Users\user\AppData\Roaming\yGkHpD.exe, PE32 8->31 dropped 33 C:\Users\user\...\yGkHpD.exe:Zone.Identifier, ASCII 8->33 dropped 35 C:\Users\user\AppData\Local\...\tmp7EE5.tmp, XML 8->35 dropped 37 C:\Users\user\AppData\...\gunzipped.exe.log, ASCII 8->37 dropped 57 Uses schtasks.exe or at.exe to add and modify task schedules 8->57 59 Adds a directory exclusion to Windows Defender 8->59 61 Injects a PE file into a foreign processes 8->61 12 gunzipped.exe 196 8->12         started        17 powershell.exe 25 8->17         started        19 schtasks.exe 1 8->19         started        signatures5 process6 dnsIp7 47 master101work.co 172.67.210.96, 49764, 80 CLOUDFLARENETUS United States 12->47 39 C:\ProgramData\vcruntime140.dll, PE32 12->39 dropped 41 C:\ProgramData\sqlite3.dll, PE32 12->41 dropped 43 C:\ProgramData\softokn3.dll, PE32 12->43 dropped 45 4 other files (none is malicious) 12->45 dropped 63 Tries to harvest and steal browser information (history, passwords, etc) 12->63 65 Tries to steal Crypto Currency Wallets 12->65 21 cmd.exe 1 12->21         started        23 conhost.exe 17->23         started        25 conhost.exe 19->25         started        file8 signatures9 process10 process11 27 taskkill.exe 1 21->27         started        29 conhost.exe 21->29         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/c87ec3f9dfb87a10f1c38102a3c58bc2cbb252891b5c882f3c4f3f0a9058b170/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2022-07-27 15:06:07 UTC
File Type:
PE (.Net Exe)
Extracted files:
12
AV detection:
17 of 26 (65.38%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=zb7mh6o7xb5bb4odqebkhrmlylf3euujdnoiqlz4j47qvecywfya._file
Verdict:
malicious
Similar samples:
11810610b0fcbfe0edc318d79ede6dcbb2c4b34dccbace91d3775001187c3c96
OskiStealer
1c53cbedc20ce9cf5b5e69fac6211133faa197f85b214a865f71cf4e0879dd99
OskiStealer
41257a21d27bcb773bb43e7b23c918d5ea4135a868b915d0fb738cd5c19af256
OskiStealer
6107e3ec5898ce2f80b04ee16b3a41107a0733339cded01cf8c5ade5fc105472
OskiStealer
8399c97b606bb6613f99006964a47064e402e6489574b85db7a9872f601886b2
OskiStealer
89ec309c384717284199d66d01669738ce37d9fb445a8f7f2259dfd6ca888f5d
OskiStealer
ae672a54491d01385af7932cc9524889f6314dd4b4b8b9a846dfa1ffedaa8c61
OskiStealer
aec9eb81f2a2837488165119d41da8eec94607b9bde0b729f811ced008ad95cb
OskiStealer
+ 4'572 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/220727-sgqjysafc7/
Behaviour
Checks processor information in registry
Creates scheduled task(s)
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
Checks computer location settings
Deletes itself
Loads dropped DLL
Reads user/profile data of web browsers
Downloads MZ/PE file
Oski
Malware Config
C2 Extraction:
master101work.co
Unpacked files
SH256 hash:
39c2d879c57f07305ce60412dc8a88f02e51f1a14a06cc605768d1d7f5313807
MD5 hash:
db51fe170a9e5d6ec5429a2fbd9d0353
SHA1 hash:
e30a58125fc41322db6cf2ccb6a6d414ed379016
Link:
https://www.unpac.me/results/1ae29f8d-6bd6-471c-84f8-c4b0ac3c5430/
SH256 hash:
e564513c43380315992640814660840a5b4703eb1bdd83e4bfb41adc8b00a952
MD5 hash:
745a8ebc59de416f9fd30feff3a73c8c
SHA1 hash:
929a6c83ae8973d863cf4640a979b86da829b988
Link:
https://www.unpac.me/results/1ae29f8d-6bd6-471c-84f8-c4b0ac3c5430/
SH256 hash:
faa8bb252258c101cb095f6ef07ec4d1648cba5d39199194ad75c28e9ba517be
MD5 hash:
e1323802326296b41357afc4949bb2ef
SHA1 hash:
73daa273aa68d36ced8d51428b651a0720a1e307
Link:
https://www.unpac.me/results/1ae29f8d-6bd6-471c-84f8-c4b0ac3c5430/
SH256 hash:
a1d5ca8cab4d6f4f52bb9af7a1817a1b7ca53bb7c49b40f69488b3215e3205a9
MD5 hash:
d633c15a25551dc3982f1d4982a3513e
SHA1 hash:
31929b6f661475b09b985ff0ea9ee134d4fa1f81
Detections:
win_oski_g0
Create hunting rule
win_oski_auto
Create hunting rule
OskiStealer
Create hunting rule
Link:
https://www.unpac.me/results/1ae29f8d-6bd6-471c-84f8-c4b0ac3c5430/
SH256 hash:
1e4459682824f756976147ba9c92bd7368d377c806d338f08244eb16a118cb63
MD5 hash:
a03bef15318296ed5d597b7c9bac28a5
SHA1 hash:
1075058d58220e06c0a3a8546f281dcfd86267a6
Link:
https://www.unpac.me/results/1ae29f8d-6bd6-471c-84f8-c4b0ac3c5430/
SH256 hash:
c87ec3f9dfb87a10f1c38102a3c58bc2cbb252891b5c882f3c4f3f0a9058b170
MD5 hash:
02c69e67c2f23c547d0022147da9fbe9
SHA1 hash:
6686b9d64df9a2c31f61c5a6682b2d899ab1a599
Link:
https://www.unpac.me/results/1ae29f8d-6bd6-471c-84f8-c4b0ac3c5430/
Please note that we are no longer able to provide a coverage score for Virus Total.

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: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.

Cape
Cape
https://www.capesandbox.com/analysis/294672/

Comments