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Windows
Analysis Report
ekstre_pdf.exe
Overview
General Information
Detection
FormBook, GuLoader
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Multi AV Scanner detection for submitted file
Yara detected FormBook
Malicious sample detected (through community Yara rule)
System process connects to network (likely due to code injection or exploit)
Antivirus detection for URL or domain
Yara detected GuLoader
Snort IDS alert for network traffic
Sample uses process hollowing technique
Maps a DLL or memory area into another process
Initial sample is a PE file and has a suspicious name
Tries to detect Any.run
Modifies the prolog of user mode functions (user mode inline hooks)
Queues an APC in another process (thread injection)
Modifies the context of a thread in another process (thread injection)
C2 URLs / IPs found in malware configuration
Uses 32bit PE files
Yara signature match
Antivirus or Machine Learning detection for unpacked file
May sleep (evasive loops) to hinder dynamic analysis
Contains functionality to shutdown / reboot the system
Uses code obfuscation techniques (call, push, ret)
Internet Provider seen in connection with other malware
Detected potential crypto function
Found potential string decryption / allocating functions
Sample execution stops while process was sleeping (likely an evasion)
Contains functionality to call native functions
Contains functionality to dynamically determine API calls
HTTP GET or POST without a user agent
IP address seen in connection with other malware
Contains functionality for execution timing, often used to detect debuggers
Enables debug privileges
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Sample file is different than original file name gathered from version info
Drops PE files
Tries to load missing DLLs
Contains functionality to read the PEB
Uses a known web browser user agent for HTTP communication
Checks if the current process is being debugged
PE / OLE file has an invalid certificate
Found large amount of non-executed APIs
Creates a process in suspended mode (likely to inject code)
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Contains functionality for read data from the clipboard
Classification
- System is w10x64native
- ekstre_pdf.exe (PID: 6632 cmdline:
C:\Users\u ser\Deskto p\ekstre_p df.exe MD5: A37DC47F86E84E5D0D2E6414C3CD5272) - ekstre_pdf.exe (PID: 3132 cmdline:
C:\Users\u ser\Deskto p\ekstre_p df.exe MD5: A37DC47F86E84E5D0D2E6414C3CD5272) - explorer.exe (PID: 4676 cmdline:
C:\Windows \Explorer. EXE MD5: 5EA66FF5AE5612F921BC9DA23BAC95F7) - autoconv.exe (PID: 9804 cmdline:
C:\Windows \SysWOW64\ autoconv.e xe MD5: 469594005E3B94C5945BCCE7FC521C05) - cmd.exe (PID: 6400 cmdline:
C:\Windows \SysWOW64\ cmd.exe MD5: D0FCE3AFA6AA1D58CE9FA336CC2B675B) - cmd.exe (PID: 6844 cmdline:
/c del "C: \Users\use r\Desktop\ ekstre_pdf .exe" MD5: D0FCE3AFA6AA1D58CE9FA336CC2B675B) - conhost.exe (PID: 3348 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 81CA40085FC75BABD2C91D18AA9FFA68)
- cleanup
Name | Description | Attribution | Blogpost URLs | Link |
---|---|---|---|---|
Formbook, Formbo | FormBook contains a unique crypter RunPE that has unique behavioral patterns subject to detection. It was initially called "Babushka Crypter" by Insidemalware. |
Name | Description | Attribution | Blogpost URLs | Link |
---|---|---|---|---|
CloudEyE, GuLoader | CloudEyE (initially named GuLoader) is a small VB5/6 downloader. It typically downloads RATs/Stealers, such as Agent Tesla, Arkei/Vidar, Formbook, Lokibot, Netwire and Remcos, often but not always from Google Drive. The downloaded payload is xored. | No Attribution |
{"C2 list": ["www.crosswalkconsulting.co.uk/mi94/"], "decoy": ["realdigitalmarketing.co.uk", "athle91.com", "zetuinteriors.africa", "jewelry2adore.biz", "sneakersuomo.com", "hotcoa.com", "bestpetfinds.com", "elatedfreedom.com", "louisegoulet.com", "licensescape.com", "jenniferfalconerrealtor.com", "xqan.net", "textare.net", "doctorlinkscsk.link", "bizformspro.com", "ameriealthcaritasfl.com", "hanfengmeiye.com", "anjin98.com", "credit-cards-54889.com", "dinero.news", "naijastudy.africa", "cursosweb22.online", "furniture-61686.com", "furniture-42269.com", "emiu6696.com", "herhustlenation.com", "kevinjasperinc.africa", "hear-aid-92727.com", "goodlifeprojectofficial.com", "freshteak.com", "bellvaniamail.com", "peterslawonline.com", "analogfair.com", "fornettobarbecues.com", "6880365.com", "couragetokingdom.com", "luivix.online", "3ay82.xyz", "tmcgroup.africa", "canadianbreederprogram.com", "funtime28.online", "customcarpentry.uk", "anotherworldrecord.com", "aux100000epices.com", "edelman-production.com", "honorproduct.com", "danuzioneto.com", "iltuosentiero.com", "healthinsurancearena.com", "hunterboots--canada.com", "irestoreart.com", "lapalmaaccesible.com", "khbmfbank.africa", "laxmi.digital", "leqidt.tax", "fluffyjet.online", "chuckclouds.com", "bril-kre-l25.buzz", "centracul.online", "legacyengravers.com", "guesstheword.net", "ded-morozvrn.online", "lemonga.com", "crrgbb.com"]}
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
JoeSecurity_FormBook | Yara detected FormBook | Joe Security | ||
Formbook | detect Formbook in memory | JPCERT/CC Incident Response Group |
| |
Formbook_1 | autogenerated rule brought to you by yara-signator | Felix Bilstein - yara-signator at cocacoding dot com |
| |
Windows_Trojan_Formbook_1112e116 | unknown | unknown |
| |
Click to see the 24 entries |
⊘No Sigma rule has matched
Timestamp: | 192.168.11.2038.163.115.13149855802031453 04/11/23-09:50:54.919147 |
SID: | 2031453 |
Source Port: | 49855 |
Destination Port: | 80 |
Protocol: | TCP |
Classtype: | A Network Trojan was detected |
Timestamp: | 192.168.11.2034.138.169.849844802018752 04/11/23-09:48:14.448694 |
SID: | 2018752 |
Source Port: | 49844 |
Destination Port: | 80 |
Protocol: | TCP |
Classtype: | A Network Trojan was detected |
Timestamp: | 192.168.11.2038.163.115.13149855802031412 04/11/23-09:50:54.919147 |
SID: | 2031412 |
Source Port: | 49855 |
Destination Port: | 80 |
Protocol: | TCP |
Classtype: | A Network Trojan was detected |
Timestamp: | 192.168.11.2038.163.115.13149855802031449 04/11/23-09:50:54.919147 |
SID: | 2031449 |
Source Port: | 49855 |
Destination Port: | 80 |
Protocol: | TCP |
Classtype: | A Network Trojan was detected |
Click to jump to signature section
Show All Signature Results
AV Detection |
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Source: | Code function: | 0_2_00405C49 | |
Source: | Code function: | 0_2_00406873 | |
Source: | Code function: | 0_2_0040290B |
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