MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 38fd5a643cd329cff4a7304970bbc9493e0df309bee2fdd5d11c42ceef27a7c1. 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: 13


Intelligence 13 IOCs YARA 3 File information Comments
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SHA256 hash: 38fd5a643cd329cff4a7304970bbc9493e0df309bee2fdd5d11c42ceef27a7c1
SHA3-384 hash: 24fd64825086b7282c67469e0147928fbbaf481dd32f5d45cb5a475db9fd79501335e7f0bb70814734b9a60827c9526d
SHA1 hash: dd01a78ff1fed202da9d0477d3dca2d93d624904
MD5 hash: 36ad1ecd6b0f7db0870eee41a3ea5840
humanhash: west-idaho-rugby-violet
File name:36ad1ecd6b0f7db0870eee41a3ea5840.rtf
Download: download sample
Signature Formbook
Create hunting rule
File size:76'191 bytes
First seen:2023-08-08 07:18:47 UTC
Last seen:Never
File type:Rich Text Format (RTF) rtf
MIME type:text/rtf
ssdeep 768:TwAbZSibMX9gRWj4pSfSEL2WL1cePS3qnl8tXPyilnoTIK6EMXBxV:TwAlRDpSKpWLep3qnlM/yilnonMXF
TLSH T10073146DD34F01A9CF65523B9B26094582FCBB7EF24012A530AC433533EED2DA6265BD
Reporter abuse_ch
Tags:CVE-2017-11882 FormBook rtf

Intelligence

File Origin
# of uploads :
1
# of downloads :
124
Origin country :
NL NL
Vendor Threat Intelligence
Malware family:
formbook
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ID:
1
File name:
36ad1ecd6b0f7db0870eee41a3ea5840.rtf
Verdict:
Malicious activity
Analysis date:
2023-08-08 07:24:52 UTC
Tags:
exploit cve-2017-11882 loader formbook xloader
Link:
https://app.any.run/tasks/2ba85aec-d759-4896-9e20-3849a8e4a06b

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
Sanesecurity.Malware.29015.RtfHeur.Msg.UNOFFICIAL
Create hunting rule

Sanesecurity.Shelter.Malware.BadRtf.ObjUpd.UNOFFICIAL
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Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Sending a custom TCP request
Searching for synchronization primitives
Launching a process
Creating a window
Creating a file in the %AppData% directory
Сreating synchronization primitives
Sending an HTTP GET request to an infection source by exploiting the app vulnerability
Creating a process from a recently created file
Result
Verdict:
Malicious
File Type:
RTF File
Link:
https://app.docguard.net/38fd5a643cd329cff4a7304970bbc9493e0df309bee2fdd5d11c42ceef27a7c1/results/dashboard
Behaviour
BlacklistAPI detected
Gathering data
Verdict:
Malicious
Labled as:
CVE-2018-0802
Link:
https://www.hybrid-analysis.com/sample/38fd5a643cd329cff4a7304970bbc9493e0df309bee2fdd5d11c42ceef27a7c1
Result
Verdict:
MALICIOUS
Result
Threat name:
FormBook
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Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1287516
Signature
.NET source code contains potential unpacker
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Detected FormBook malware
Found malware configuration
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
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)
Office equation editor drops PE file
Office equation editor establishes network connection
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Performs DNS queries to domains with low reputation
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: File Dropped By EQNEDT32EXE
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1287516 Sample: pWVuFwBYuQ.rtf Startdate: 08/08/2023 Architecture: WINDOWS Score: 100 64 Found malware configuration 2->64 66 Malicious sample detected (through community Yara rule) 2->66 68 Antivirus detection for URL or domain 2->68 70 14 other signatures 2->70 10 EQNEDT32.EXE 11 2->10         started        15 WINWORD.EXE 291 14 2->15         started        process3 dnsIp4 54 2.59.254.18, 49159, 80 CMCSUS Germany 10->54 38 C:\Users\user\AppData\...\defoundoh68951.exe, PE32 10->38 dropped 40 C:\Users\user\AppData\...\defounderzx[1].exe, PE32 10->40 dropped 84 Office equation editor establishes network connection 10->84 86 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 10->86 17 defoundoh68951.exe 1 5 10->17         started        42 ~WRF{7B071914-9B04...0-8A5ADEF355D0}.tmp, Composite 15->42 dropped file5 signatures6 process7 signatures8 56 Multi AV Scanner detection for dropped file 17->56 58 Machine Learning detection for dropped file 17->58 60 Tries to detect virtualization through RDTSC time measurements 17->60 62 Injects a PE file into a foreign processes 17->62 20 defoundoh68951.exe 17->20         started        process9 signatures10 72 Modifies the context of a thread in another process (thread injection) 20->72 74 Maps a DLL or memory area into another process 20->74 76 Sample uses process hollowing technique 20->76 78 Queues an APC in another process (thread injection) 20->78 23 explorer.exe 4 5 20->23 injected process11 dnsIp12 48 www.bbhggzni.cfd 192.74.228.253, 49167, 49168, 49169 PEGTECHINCUS United States 23->48 50 www.wyliscz.xyz 207.148.97.245, 49163, 49164, 49165 AS-CHOOPAUS United States 23->50 52 2 other IPs or domains 23->52 80 System process connects to network (likely due to code injection or exploit) 23->80 82 Performs DNS queries to domains with low reputation 23->82 27 help.exe 15 23->27         started        31 autochk.exe 23->31         started        signatures13 process14 file15 44 C:\Users\user\AppData\...\926logrv.ini, data 27->44 dropped 46 C:\Users\user\AppData\...\926logri.ini, data 27->46 dropped 88 Detected FormBook malware 27->88 90 Tries to steal Mail credentials (via file / registry access) 27->90 92 Tries to harvest and steal browser information (history, passwords, etc) 27->92 94 4 other signatures 27->94 33 firefox.exe 1 27->33         started        signatures16 process17 file18 36 C:\Users\user\AppData\...\926logrf.ini, data 33->36 dropped
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/38fd5a643cd329cff4a7304970bbc9493e0df309bee2fdd5d11c42ceef27a7c1/
Threat name:
Document-RTF.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2023-08-07 06:27:27 UTC
File Type:
Document
Extracted files:
3
AV detection:
14 of 38 (36.84%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=hd6vuzb42mu475fhgbexbo6jje7a34yjx3rp3vordrbm53zhu7aq._file
Result
Malware family:
formbook
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Score:
  10/10
Tags:
family:formbook campaign:fd62 rat spyware stealer trojan
Link:
https://tria.ge/reports/230808-h5h5nsbb88/
Behaviour
Launches Equation Editor
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Drops file in Windows directory
Suspicious use of SetThreadContext
Executes dropped EXE
Loads dropped DLL
Blocklisted process makes network request
Downloads MZ/PE file
Formbook payload
Formbook
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/38fd5a643cd329cff4a7304970bbc9493e0df309bee2fdd5d11c42ceef27a7c1

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:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:INDICATOR_RTF_MalVer_Objects
Create hunting rule
Author:ditekSHen
Description:Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents.
Rule name:SUSP_INDICATOR_RTF_MalVer_Objects
Create hunting rule
Author:ditekSHen
Description:Detects RTF documents with non-standard version and embedding one of the object mostly observed in exploit (e.g. CVE-2017-11882) documents.
Reference:https://github.com/ditekshen/detection

File information

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

Web download

Formbook

Rich Text Format (RTF) rtf 38fd5a643cd329cff4a7304970bbc9493e0df309bee2fdd5d11c42ceef27a7c1

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/2696808/
  
Delivery method
Distributed via web download

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