MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 51df8dbd84d3831889b6ade693f942a9b18100f1e2fef0f548ccc1af87e64909. 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


Ostap


Vendor detections: 6


Intelligence 6 IOCs YARA 6 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 51df8dbd84d3831889b6ade693f942a9b18100f1e2fef0f548ccc1af87e64909
SHA3-384 hash: 9c79e310e4683d67af1fe71a760b34b37d5e5e6be56d5598a1b346c607cd706e9b47017c8dd4de2132aa978daa175416
SHA1 hash: 53bfa7f071b17c108cff45d69b74f8f36e6fed9f
MD5 hash: 5ce0230125d6cd6ed936b1e10ab03a9c
humanhash: king-william-table-snake
File name:5ce0230125d6cd6ed936b1e10ab03a9c.xls
Download: download sample
Signature Ostap
Create hunting rule
File size:845'824 bytes
First seen:2020-10-17 07:47:33 UTC
Last seen:2020-10-17 08:44:11 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 6144:5k3hOdsylKlgryzc4bNhZF+E+W2kQCAH8SD4HW44KwACfnVIGI70:tCCD
TLSH D905FE566B73F825AE1A35B01127324DFE5B68644F8050B3E872EE7C79F4506C932B2B
Reporter abuse_ch
Tags:Ostap xls


Avatar
abuse_ch
Ostap C2:
https://194.36.191.177/sim/sim.php

Intelligence

File Origin
# of uploads :
2
# of downloads :
129
Origin country :
n/a
Vendor Threat Intelligence
Detection(s):
TwinWave.MacroDoc.CROSPLICEMINESOFKESSEL.20191220.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.CROVarsCallerTheTwisting.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.CROStringBuilderHidingPlacesPapaDontTakeNoMess.20200916.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.CBNStringBuilderHidingPlacesPapaDontTakeNoMess.20200916.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Creating a file
Moving a recently created file
Using the Windows Management Instrumentation requests
Sending a custom TCP request
DNS request
Creating a process from a recently created file
Result
Threat name:
Unknown
Detection:
malicious
Classification:
spyw.expl.evad
Score:
80 / 100
Link:
https://www.joesandbox.com/analysis/494351
Signature
Document contains an embedded VBA macro with suspicious strings
Document contains an embedded VBA with functions possibly related to ADO stream file operations
Document exploit detected (process start blacklist hit)
Multi AV Scanner detection for submitted file
Opens network shares
Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines)
Sigma detected: Microsoft Office Product Spawning Windows Shell
System process connects to network (likely due to code injection or exploit)
Behaviour
Behavior Graph:
Download SVG
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/51df8dbd84d3831889b6ade693f942a9b18100f1e2fef0f548ccc1af87e64909/
Threat name:
Document-Office.Trojan.GenScript
Create hunting rule
Status:
Malicious
First seen:
2020-10-17 07:49:05 UTC
AV detection:
16 of 29 (55.17%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=khpy3pme2obrrcnwvxtjh6kcvgyycahr4l7pb5kizta27b7gjeeq._file
Result
Malware family:
n/a
Score:
  10/10
Tags:
n/a
Link:
https://tria.ge/reports/201017-vn2lkhnrk2/
Behaviour
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Checks processor information in registry
Enumerates system info in registry
Office loads VBA resources, possible macro or embedded object present
JavaScript code in executable
Blacklisted process makes network request
Process spawned unexpected child process
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/51df8dbd84d3831889b6ade693f942a9b18100f1e2fef0f548ccc1af87e64909

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:ach_Ostap_xlsm_20201016
Create hunting rule
Author:abuse.ch
Description:Detects Ostap XLSM
Rule name:Email_stealer_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Email in files like avemaria
Rule name:IPPort_combo_mem
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:Select_from_enumeration
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:SharedStrings
Create hunting rule
Author:Katie Kleemola
Description:Internal names found in LURK0/CCTV0 samples
Rule name:UAC_bypass_bin_mem
Create hunting rule
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.

Web download

Ostap

Excel file xls 51df8dbd84d3831889b6ade693f942a9b18100f1e2fef0f548ccc1af87e64909

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/703509/
  
Delivery method
Distributed via web download

Comments