MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 244cc88debf6465b93584d1f63c592c52bd029deec2f24fc4a3328725838d239. 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
| SHA256 hash: | 244cc88debf6465b93584d1f63c592c52bd029deec2f24fc4a3328725838d239 |
|---|---|
| SHA3-384 hash: | 759726d6a13756c2da13f1f178aab1fdd5eb0ab7e33c44ac805788c49c736cda04e1a9769501150d62805bb9b6f4093c |
| SHA1 hash: | 3fcdd6ff8323713c8cf3e11edca6c5e195dd4139 |
| MD5 hash: | b0926a6e4c1887f81024b17df73199c5 |
| humanhash: | crazy-item-blossom-oscar |
| File name: | PO5621.scr.exe |
| Download: | download sample |
| Signature | OskiStealer |
| File size: | 314'076 bytes |
| First seen: | 2021-05-06 11:26:06 UTC |
| Last seen: | 2021-05-06 12:02:11 UTC |
| File type: |  exe |
| MIME type: | application/x-dosexec |
| imphash | ced282d9b261d1462772017fe2f6972b (127 x Formbook, 113 x GuLoader, 70 x RemcosRAT) |
| ssdeep | 6144:r9X0G1ssJABzz0J6DZ49XrOwDgBHiU/liJNatZ7Vael:F0mfABzz0qq8wDCiUMy7Vb |
| Threatray | 1'134 similar samples on MalwareBazaar |
| TLSH | DA64F1D7F6D0D9E3D554A9301D36F13DA6764A5492841FA2CE80FFAC7812222153F8AF |
| Reporter |  abuse_ch |
| Tags: | exe OskiStealer |
Indicators Of Compromise (IOCs)
Below is a list of indicators of compromise (IOCs) associated with this malware samples.
| IOC | ThreatFox Reference |
|---|---|
| http://203.159.80.65/6.jpg | https://threatfox.abuse.ch/ioc/30288/ |
| http://203.159.80.65/1.jpg | https://threatfox.abuse.ch/ioc/30289/ |
| http://203.159.80.65/2.jpg | https://threatfox.abuse.ch/ioc/30290/ |
| http://203.159.80.65/3.jpg | https://threatfox.abuse.ch/ioc/30291/ |
| http://203.159.80.65/4.jpg | https://threatfox.abuse.ch/ioc/30292/ |
| http://203.159.80.65/5.jpg | https://threatfox.abuse.ch/ioc/30293/ |
| http://203.159.80.65/7.jpg | https://threatfox.abuse.ch/ioc/30294/ |
Intelligence
File Origin
# of uploads :
2
# of downloads :
130
Origin country :
n/a
Vendor Threat Intelligence
Detection:
Vidar
Result
Verdict:
Malware
Maliciousness:
Behaviour
Creating a file in the %temp% directory
Creating a file
Unauthorized injection to a recently created process
Connection attempt
Sending a UDP request
Deleting a recently created file
Reading critical registry keys
Replacing files
Creating a window
Delayed writing of the file
Running batch commands
Creating a process with a hidden window
Using the Windows Management Instrumentation requests
Searching for the window
Stealing user critical data
Launching a tool to kill processes
Result
Verdict:
MALICIOUS
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
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Signature
Detected unpacking (changes PE section rights)
Detected unpacking (overwrites its own PE header)
Downloads files with wrong headers with respect to MIME Content-Type
Found malware configuration
Found many strings related to Crypto-Wallets (likely being stolen)
Icon mismatch, binary includes an icon from a different legit application in order to fool users
Machine Learning detection for sample
Maps a DLL or memory area into another process
Posts data to a JPG file (protocol mismatch)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Crypto Currency Wallets
Yara detected Oski Stealer
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Threat name:
Win32.Trojan.Predator
Status:
Malicious
First seen:
2021-05-06 11:26:10 UTC
AV detection:
16 of 28 (57.14%)
Threat level:
5/5
Detection(s):
Malicious file
Verdict:
malicious
Similar samples:
+ 1'124 additional samples on MalwareBazaar
Result
Malware family:
oski
Score:
10/10
Tags:
family:oski discovery infostealer spyware stealer
Behaviour
Checks processor information in registry
Kills process with taskkill
Suspicious behavior: MapViewOfSection
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
Unpacked files
SH256 hash:
b4e1b5a689c836a40a478137f6335f193f0eda0a90f8bd7868c6e7bc96f30fe3
MD5 hash:
8102c61b4698d608f7912b3979dc60a9
SHA1 hash:
48741a2b677d4214dce9dd7fdc8c09f0c71273e4
SH256 hash:
244cc88debf6465b93584d1f63c592c52bd029deec2f24fc4a3328725838d239
MD5 hash:
b0926a6e4c1887f81024b17df73199c5
SHA1 hash:
3fcdd6ff8323713c8cf3e11edca6c5e195dd4139
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
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 |
|---|---|
| Author: | ditekSHen |
| Description: | Detects Vidar / ArkeiStealer |
| Rule name: | Vidar |
|---|---|
| Author: | kevoreilly |
| Description: | Vidar Payload |
| Rule name: | win_oski_auto |
|---|---|
| Author: | Felix Bilstein - yara-signator at cocacoding dot com |
| Description: | autogenerated rule brought to you by yara-signator |
| Rule name: | win_oski_g0 |
|---|---|
| Author: | Slavo Greminger, SWITCH-CERT |
File information
The table below shows additional information about this malware sample such as delivery method and external references.
Comments
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MBC behaviors list (github.com/accidentalrebel/mbcscan):
============================================================
0) [B0001.032] Anti-Behavioral Analysis::Timing/Delay Check GetTickCount
1) [C0032.001] Data Micro-objective::CRC32::Checksum
2) [C0026.002] Data Micro-objective::XOR::Encode Data
5) [C0045] File System Micro-objective::Copy File
6) [C0046] File System Micro-objective::Create Directory
7) [C0048] File System Micro-objective::Delete Directory
8) [C0047] File System Micro-objective::Delete File
9) [C0049] File System Micro-objective::Get File Attributes
10) [C0051] File System Micro-objective::Read File
11) [C0050] File System Micro-objective::Set File Attributes
12) [C0052] File System Micro-objective::Writes File
13) [E1510] Impact::Clipboard Modification
14) [C0034.001] Operating System Micro-objective::Set Variable::Environment Variable
15) [C0036.004] Operating System Micro-objective::Create Registry Key::Registry
16) [C0036.002] Operating System Micro-objective::Delete Registry Key::Registry
17) [C0036.007] Operating System Micro-objective::Delete Registry Value::Registry
18) [C0036.003] Operating System Micro-objective::Open Registry Key::Registry
19) [C0036.005] Operating System Micro-objective::Query Registry Key::Registry
20) [C0036.006] Operating System Micro-objective::Query Registry Value::Registry
21) [C0036.001] Operating System Micro-objective::Set Registry Key::Registry
22) [C0017] Process Micro-objective::Create Process
23) [C0038] Process Micro-objective::Create Thread
24) [C0018] Process Micro-objective::Terminate Process