MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 d166ce232dd96e2633f4913d3e964dadedf76ff88a7c998edc7cd479defc6a90. 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


Formbook


Vendor detections: 6


Intelligence 6 IOCs YARA 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: d166ce232dd96e2633f4913d3e964dadedf76ff88a7c998edc7cd479defc6a90
SHA3-384 hash: d8e09b7c72c8dc403bff966e5d6e361a56004c4c4db689c0898b47dac95fc33c73f28a2f850c354292db284036e3a016
SHA1 hash: fc176dbc7bfb7407cb9603652215d1b729f4c9b6
MD5 hash: e632f3a85aa5fb027957d0e4b8758bc5
humanhash: undress-cat-juliet-stream
File name:INV SF2910202.doc
Download: download sample
Signature Formbook
Create hunting rule
File size:2'220'416 bytes
First seen:2020-11-23 10:15:33 UTC
Last seen:2020-11-23 14:12:12 UTC
File type:Word file doc
MIME type:text/rtf
ssdeep 384:NCkTIXxP2299PAfwK/+71mw6vz2p35qFkTIXxP2299PLkTIXxP2299Por6E6E6Ec:N2AfjDPxoumE
TLSH 69A5CB9225785202E4A936457FBB3F15F92F321179C2248CDBC8DDEC68A2DD79281CDE
Reporter cocaman
Tags:doc FormBook

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 dump

Intelligence

File Origin
# of uploads :
4
# of downloads :
152
Origin country :
n/a
Vendor Threat Intelligence
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a file in the %temp% directory
Launching a process
Creating a window
Creating a process with a hidden window
Using the Windows Management Instrumentation requests
Launching the default Windows debugger (dwwin.exe)
DNS request
Sending a custom TCP request
Deleting a recently created file
Bypassing of proactive protection methods using Windows Management Instrumentation (WMI)
Running batch commands by exploiting the app vulnerability
Creating a process from a recently created file
Launching a process by exploiting the app vulnerability
Result
Gathering data
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/544983
Signature
Creates processes via WMI
Document exploit detected (creates forbidden files)
Found potential equation exploit (CVE-2017-11882)
Found suspicious RTF objects
Injects a PE file into a foreign processes
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Microsoft Office drops suspicious files
Modifies the context of a thread in another process (thread injection)
Modifies the prolog of user mode functions (user mode inline hooks)
Multi AV Scanner detection for submitted file
Obfuscated command line found
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines)
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Sigma detected: Droppers Exploiting CVE-2017-11882
Sigma detected: Office product drops script at suspicious location
Sigma detected: WScript or CScript Dropper
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Very long command line found
Writes to foreign memory regions
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 321584 Sample: INV SF2910202.doc Startdate: 23/11/2020 Architecture: WINDOWS Score: 100 42 Malicious sample detected (through community Yara rule) 2->42 44 Multi AV Scanner detection for submitted file 2->44 46 Sigma detected: Office product drops script at suspicious location 2->46 48 8 other signatures 2->48 9 powershell.exe 4 140 2->9         started        13 WINWORD.EXE 292 25 2->13         started        16 EQNEDT32.EXE 47 2->16         started        process3 dnsIp4 40 cdn.discordapp.com 162.159.135.233, 443, 49165 CLOUDFLARENETUS United States 9->40 62 Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines) 9->62 64 Writes to foreign memory regions 9->64 66 Injects a PE file into a foreign processes 9->66 18 control.exe 9->18         started        34 C:\Users\user\AppData\Local\Temp\shed.vbs, ASCII 13->34 dropped 68 Document exploit detected (creates forbidden files) 13->68 70 Microsoft Office drops suspicious files 13->70 72 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 16->72 21 cmd.exe 16->21         started        file5 signatures6 process7 signatures8 50 Modifies the context of a thread in another process (thread injection) 18->50 52 Maps a DLL or memory area into another process 18->52 54 Sample uses process hollowing technique 18->54 56 2 other signatures 18->56 23 explorer.exe 18->23 injected 27 cscript.exe 21->27         started        process9 dnsIp10 36 www.zero1is.com 154.196.151.2, 49167, 80 HKMTC-AS-APHONGKONGMegalayerTechnologyCoLimitedHK Seychelles 23->36 38 www.1117whitney.com 23->38 58 System process connects to network (likely due to code injection or exploit) 23->58 29 msdt.exe 23->29         started        60 Creates processes via WMI 27->60 signatures11 process12 signatures13 74 Modifies the context of a thread in another process (thread injection) 29->74 76 Maps a DLL or memory area into another process 29->76 78 Tries to detect virtualization through RDTSC time measurements 29->78 32 cmd.exe 29->32         started        process14
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/d166ce232dd96e2633f4913d3e964dadedf76ff88a7c998edc7cd479defc6a90/
Threat name:
Win32.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2020-11-23 00:46:12 UTC
File Type:
Document
Extracted files:
7
AV detection:
15 of 28 (53.57%)
Threat level:
  5/5
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook rat spyware stealer trojan
Link:
https://tria.ge/reports/201123-x194nz5rvx/
Behaviour
Launches Equation Editor
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Checks processor information in registry
Enumerates system info in registry
NTFS ADS
Office loads VBA resources, possible macro or embedded object present
Drops file in Windows directory
Drops file in System32 directory
Suspicious use of SetThreadContext
Blacklisted process makes network request
Formbook Payload
Formbook
Process spawned unexpected child process
Malware Config
C2 Extraction:
http://www.yy798.com/dhc/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Bloodhound
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/d166ce232dd96e2633f4913d3e964dadedf76ff88a7c998edc7cd479defc6a90

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:MAL_RTF_Embedded_OLE_PE
Create hunting rule
Author:Florian Roth
Description:Detects a suspicious string often used in PE files in a hex encoded object stream
Reference:https://www.nextron-systems.com/2018/01/22/creating-yara-rules-detect-embedded-exe-files-ole-objects/

File information

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

Malspam

Formbook

Word file doc d166ce232dd96e2633f4913d3e964dadedf76ff88a7c998edc7cd479defc6a90

(this sample)

  
Delivery method
Distributed via e-mail attachment

Comments