MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 8b4ca492592f243826d9e27cf240c21d88c565cc8e807b7fa5bad677a921a8f7. 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: 11


Maldoc score: 9


Intelligence 11 IOCs 7 YARA 5 File information Comments

SHA256 hash: 8b4ca492592f243826d9e27cf240c21d88c565cc8e807b7fa5bad677a921a8f7
SHA3-384 hash: ec7059207439bc9490c42f59de3e4de9cfdd452ffa3eb4265776646b3a0d49c3ce35057a2867aaa70fa8211fdd01884d
SHA1 hash: 407303a776978591bfcce1cb8b708f3e74c54423
MD5 hash: b80c4bb88be4c946d6b6766b18279ddc
humanhash: nine-aspen-video-jersey
File name:New order.doc
Download: download sample
Signature OskiStealer
File size:150'528 bytes
First seen:2021-04-28 10:51:12 UTC
Last seen:2021-04-28 11:00:43 UTC
File type:Word file doc
MIME type:application/msword
ssdeep 1536:emMXH4g4gpA2M7KPDqq0qHXG0uODuKtQJSNT+VBWOo/BmO9x8P8vkwj5oLfpf2QO:UX4GpNXrq6uObF6VBWOckkvkwj0fpbp
TLSH A5E3F1863BD4CD2AD0A6A5704CD7C085BB99BC9EAC58839B7B447B0E7DF53704A63348
Reporter abuse_ch
Tags:doc OskiStealer


Avatar
abuse_ch
OskiStealer C2:
http://vpsthree.xyz/2.jpg

Indicators Of Compromise (IOCs)


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

IOCThreatFox Reference
http://vpsthree.xyz/6.jpg https://threatfox.abuse.ch/ioc/19649/
http://vpsthree.xyz/1.jpg https://threatfox.abuse.ch/ioc/19650/
http://vpsthree.xyz/2.jpg https://threatfox.abuse.ch/ioc/19651/
http://vpsthree.xyz/3.jpg https://threatfox.abuse.ch/ioc/19652/
http://vpsthree.xyz/4.jpg https://threatfox.abuse.ch/ioc/19653/
http://vpsthree.xyz/5.jpg https://threatfox.abuse.ch/ioc/19654/
http://vpsthree.xyz/7.jpg https://threatfox.abuse.ch/ioc/19655/

Office OLE Information


This malware samples appears to be an Office document. The following table provides more information about this document using oletools and oledump.

OLE id
Maldoc score: 9
Application name is Microsoft Office Word
Office document is in OLE format
Office document contains VBA Macros
OLE dump

MalwareBazaar was able to identify 12 sections in this file using oledump:

Section IDSection sizeSection name
1114 bytesCompObj
24096 bytesDocumentSummaryInformation
34096 bytesSummaryInformation
46975 bytes1Table
5119138 bytesData
6416 bytesMacros/PROJECT
765 bytesMacros/PROJECTwm
8952 bytesMacros/VBA/Module1
91955 bytesMacros/VBA/ThisDocument
102630 bytesMacros/VBA/_VBA_PROJECT
11561 bytesMacros/VBA/dir
124096 bytesWordDocument
OLE vba

MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:

TypeKeywordDescription
AutoExecDocument_OpenRuns when the Word or Publisher document is opened
SuspiciousCreateObjectMay create an OLE object
SuspiciousChrMay attempt to obfuscate specific strings (use option --deobf to deobfuscate)
SuspiciousexecMay run an executable file or a system
SuspiciousBase64 StringsBase64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence


File Origin
# of uploads :
2
# of downloads :
108
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
New order.doc
Verdict:
Malicious activity
Analysis date:
2021-04-28 10:53:53 UTC
Tags:
macros macros-on-open maldoc-37 generated-doc

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/msword
Has a screenshot:
False
Contains macros:
True
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Launching a process
Searching for the window
Creating a file
Delayed writing of the file
Creating a file in the %temp% subdirectories
Creating a file in the Windows subdirectories
Modifying a system file
Launching a process by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Word File with Macro
Payload URLs
URL
File name
Project.Module1.commonstand
1Table
Document image
Document image
Result
Verdict:
MALICIOUS
Details
Macro with Startup Hook
Detected macro logic that will automatically execute on document open. Most malware contains some execution hook.
Document With Few Pages
Document contains between one and three pages of content. Most malicious documents are sparse in page count.
Result
Threat name:
Detection:
malicious
Classification:
expl.troj.spyw.evad
Score:
100 / 100
Signature
Creates an undocumented autostart registry key
Document contains an embedded VBA macro which may execute processes
Document contains an embedded VBA macro with suspicious strings
Downloads files with wrong headers with respect to MIME Content-Type
Found many strings related to Crypto-Wallets (likely being stolen)
Machine Learning detection for sample
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Performs DNS queries to domains with low reputation
Posts data to a JPG file (protocol mismatch)
Powershell drops PE file
Suspicious powershell command line found
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 Vidar stealer
Behaviour
Behavior Graph:
behaviorgraph top1 signatures2 2 Behavior Graph ID: 399122 Sample: New order.doc Startdate: 28/04/2021 Architecture: WINDOWS Score: 100 58 Multi AV Scanner detection for domain / URL 2->58 60 Multi AV Scanner detection for dropped file 2->60 62 Multi AV Scanner detection for submitted file 2->62 64 10 other signatures 2->64 10 OUTLOOK.EXE 501 27 2->10         started        13 WINWORD.EXE 38 37 2->13         started        process3 file4 72 Suspicious powershell command line found 10->72 16 powershell.exe 15 18 10->16         started        52 C:\Users\user\AppData\...52ew order.doc.LNK, MS 13->52 dropped signatures5 process6 dnsIp7 54 scaladevelopments.scaladevco.com 35.208.24.64, 49731, 80 GOOGLE-2US United States 16->54 38 C:\Users\Public\Documents\despiteskin.exe, PE32 16->38 dropped 66 Powershell drops PE file 16->66 21 despiteskin.exe 6 16->21         started        25 conhost.exe 16->25         started        file8 signatures9 process10 file11 40 C:\Users\user\AppData\Roaming\...\notpad.exe, PE32 21->40 dropped 42 C:\Users\user\AppData\...\despiteskin.exe, PE32 21->42 dropped 68 Multi AV Scanner detection for dropped file 21->68 70 Creates an undocumented autostart registry key 21->70 27 despiteskin.exe 193 21->27         started        signatures12 process13 dnsIp14 56 vpsthree.xyz 95.181.164.213, 49741, 80 RACKTECHRU Russian Federation 27->56 44 C:\ProgramData\vcruntime140.dll, PE32 27->44 dropped 46 C:\ProgramData\sqlite3.dll, PE32 27->46 dropped 48 C:\ProgramData\softokn3.dll, PE32 27->48 dropped 50 4 other files (none is malicious) 27->50 dropped 74 Multi AV Scanner detection for dropped file 27->74 76 Performs DNS queries to domains with low reputation 27->76 78 Tries to harvest and steal browser information (history, passwords, etc) 27->78 80 Tries to steal Crypto Currency Wallets 27->80 32 cmd.exe 27->32         started        file15 signatures16 process17 process18 34 conhost.exe 32->34         started        36 taskkill.exe 32->36         started       
Threat name:
Document-Office.Downloader.EncDoc
Status:
Malicious
First seen:
2021-04-28 10:52:11 UTC
AV detection:
11 of 47 (23.40%)
Threat level:
  3/5
Result
Malware family:
Score:
  10/10
Tags:
family:oski discovery infostealer macro macro_on_action spyware stealer xlm
Behaviour
Checks processor information in registry
Enumerates system info in registry
Kills process with taskkill
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Office loads VBA resources, possible macro or embedded object present
Enumerates physical storage devices
Drops file in Windows directory
Drops file in System32 directory
Suspicious use of SetThreadContext
Accesses cryptocurrency files/wallets, possible credential harvesting
Checks installed software on the system
Loads dropped DLL
Reads user/profile data of web browsers
Blocklisted process makes network request
Downloads MZ/PE file
Executes dropped EXE
Oski
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:Email_stealer_bin_mem
Author:James_inthe_box
Description:Email in files like avemaria
Rule name:IPPort_combo_mem
Author:James_inthe_box
Description:IP and port combo
Rule name:Select_from_enumeration
Author:James_inthe_box
Description:IP and port combo
Rule name:SharedStrings
Author:Katie Kleemola
Description:Internal names found in LURK0/CCTV0 samples
Rule name:UAC_bypass_bin_mem
Author:James_inthe_box
Description:UAC bypass in files like avemaria

File information


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

Comments