MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 1c8cfccd2e45ea898125a62686ee97a1e923dfbbc8652889027d46b04aa5dc75. 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 1 File information Comments
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SHA256 hash: 1c8cfccd2e45ea898125a62686ee97a1e923dfbbc8652889027d46b04aa5dc75
SHA3-384 hash: b1f31be32b6c32ee37398f90a9525b2fce57cfe6af79ca28d53563177d19dd434132fab8b6543510c78a49203905510c
SHA1 hash: 42e3ded330cc4a1b6b96357eba0e0a00402439ec
MD5 hash: b9b672f41346a7e134e9ee07c25cde86
humanhash: oven-lion-ohio-south
File name:b9b672f41346a7e134e9ee07c25cde86
Download: download sample
Signature Formbook
Create hunting rule
File size:18'664 bytes
First seen:2022-10-20 04:54:07 UTC
Last seen:2022-10-20 06:15:26 UTC
File type:Rich Text Format (RTF) rtf
MIME type:text/rtf
ssdeep 192:oYQhrkxYAL+aFpssyqtZM2dvZTxPyyjv2ayTN6D85jJikmMphU0MnmZcchDebQiq:rMrA3psz0M+OyI5jwZchy9/YHBIG
TLSH T1B282137EF18A8F9CCA47D294150A3F861668F84CA3C594C2B7BCF7786B5195BD322930
Reporter zbetcheckin
Tags:CVE-2017-11882 FormBook rtf

Intelligence

File Origin
# of uploads :
2
# of downloads :
168
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
b9b672f41346a7e134e9ee07c25cde86
Verdict:
Malicious activity
Analysis date:
2022-10-20 04:57:14 UTC
Tags:
trojan opendir exploit cve-2017-11882 loader formbook stealer
Link:
https://app.any.run/tasks/27da7c40-ec77-4a3f-a332-f4d15a5bd441

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
MiscreantPunch.RTF.2017-0199.Obfus.171711.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Searching for synchronization primitives
Launching a process
Creating a window
Creating a file
Сreating synchronization primitives
Creating a file in the %temp% subdirectories
Creating a file in the Windows subdirectories
Possible injection to a system process
Sending an HTTP GET request
Creating a process from a recently created file
Unauthorized injection to a system process
Result
Verdict:
Malicious
File Type:
RTF File
Link:
https://app.docguard.net/1c8cfccd2e45ea898125a62686ee97a1e923dfbbc8652889027d46b04aa5dc75/results/dashboard
Behaviour
BlacklistAPI detected
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
CVE-2017-11882 exploit
Link:
https://www.filescan.io/uploads/6350d4a7b5f60e72b8c79ad6/reports/99575eed-fe95-4a0d-8a36-7421a14a5587/overview
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/1c8cfccd2e45ea898125a62686ee97a1e923dfbbc8652889027d46b04aa5dc75
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1093916
Signature
Allocates memory in foreign processes
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Drops PE files to the user root directory
Found API chain indicative of sandbox detection
Injects a PE file into a foreign processes
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
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)
Sample uses process hollowing technique
Shellcode detected
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: File Dropped By EQNEDT32EXE
Writes to foreign memory regions
Yara detected AntiVM autoit script
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 726538 Sample: 5nPV84ZtYN.rtf Startdate: 20/10/2022 Architecture: WINDOWS Score: 100 57 Multi AV Scanner detection for domain / URL 2->57 59 Malicious sample detected (through community Yara rule) 2->59 61 Antivirus / Scanner detection for submitted sample 2->61 63 10 other signatures 2->63 14 EQNEDT32.EXE 12 2->14         started        19 WINWORD.EXE 336 18 2->19         started        21 EQNEDT32.EXE 2->21         started        process3 dnsIp4 51 192.210.160.112, 49171, 80 AS-COLOCROSSINGUS United States 14->51 47 C:\Users\user\AppData\Local\...\vbc[1].exe, PE32 14->47 dropped 49 C:\Users\Public\vbc.exe, PE32 14->49 dropped 53 Office equation editor establishes network connection 14->53 55 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 14->55 23 vbc.exe 75 14->23         started        file5 signatures6 process7 file8 45 C:\Users\user\AppData\Local\...\hcjelge.exe, PE32 23->45 dropped 65 Multi AV Scanner detection for dropped file 23->65 27 wscript.exe 2 1 23->27         started        signatures9 process10 process11 29 hcjelge.exe 1 4 27->29         started        signatures12 75 Antivirus detection for dropped file 29->75 77 Multi AV Scanner detection for dropped file 29->77 79 Found API chain indicative of sandbox detection 29->79 32 wscript.exe 1 29->32         started        process13 process14 34 hcjelge.exe 1 32->34         started        process15 36 wscript.exe 34->36         started        process16 38 hcjelge.exe 36->38         started        process17 40 wscript.exe 38->40         started        process18 42 hcjelge.exe 40->42         started        signatures19 67 Writes to foreign memory regions 42->67 69 Allocates memory in foreign processes 42->69 71 Sample uses process hollowing technique 42->71 73 Injects a PE file into a foreign processes 42->73
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/1c8cfccd2e45ea898125a62686ee97a1e923dfbbc8652889027d46b04aa5dc75/
Threat name:
Document-RTF.Exploit.CVE-2017-11882
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Status:
Malicious
First seen:
2022-10-17 16:33:29 UTC
File Type:
Document
Extracted files:
4
AV detection:
18 of 41 (43.90%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=dsgpztjoixvitajfuytin3uxuhushx53zbssrcicpvdlasvf3r2q._file
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:ubpr persistence rat spyware stealer trojan
Link:
https://tria.ge/reports/221020-fj4s5sehaj/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Launches Equation Editor
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
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
Suspicious use of SetThreadContext
Adds Run key to start application
Loads dropped DLL
Reads user/profile data of web browsers
Uses the VBS compiler for execution
Blocklisted process makes network request
Downloads MZ/PE file
Executes dropped EXE
Formbook
Verdict:
Suspicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/d49c428b-49de-48a0-a233-c3a99a6a9e11
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Formbook
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/1c8cfccd2e45ea898125a62686ee97a1e923dfbbc8652889027d46b04aa5dc75

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: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.

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 1c8cfccd2e45ea898125a62686ee97a1e923dfbbc8652889027d46b04aa5dc75

(this sample)

  
Delivery method
Distributed via web download

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