MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 bd4f44ebdc75f53514f780516dfcb2c0a70f0fcec4d964a75fde9373bd51907e. 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: 9


Maldoc score: 27


Intelligence 9 IOCs YARA 5 File information Comments
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SHA256 hash: bd4f44ebdc75f53514f780516dfcb2c0a70f0fcec4d964a75fde9373bd51907e
SHA3-384 hash: b2b1767179f0e002a6e9fed53344a368e10578b86be72d178758655ae02c8da0c90340bed9cc518a6109b6e1429ad270
SHA1 hash: ce1e163ec128eb9b882d1101d45b97004d526eee
MD5 hash: 6579b0ded0abd88289655bb976b67cd0
humanhash: don-speaker-quiet-india
File name:proposal.xlsm
Download: download sample
Signature Formbook
Create hunting rule
File size:2'796'236 bytes
First seen:2021-02-23 06:58:41 UTC
Last seen:Never
File type:Excel file xlsm
MIME type:application/octet-stream
ssdeep 1536:jqVD0/Gp4ybFf77kD92PHvV2ZG0nIcjELcdpl:W50+Nbh77449sG0n9/l
TLSH 78D54424F1173242C2E6857680B623F2B337497F0A5A5B862BF68BB81C817F537D6E45
Reporter abuse_ch
Tags:CVE-2017-11882 FormBook xlsm


Avatar
abuse_ch
Malspam distributing Formbook:

HELO: dedic-bds-714413.hosted-by-itldc.com
Sending IP: 82.118.21.193
From: Director's Office <info@betterpack.com>
Reply-To: <director@lilingroup.myvnc.com>
Subject: Linkedin Business proposal as discussed
Attachment: proposal.xlsm

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 id
Maldoc score: 27
OLE dump

MalwareBazaar was able to identify 26 sections in this file using oledump:

Section IDSection sizeSection name
A1652 bytesPROJECT
A2173 bytesPROJECTwm
A3740 bytesVBA/Module1
A4136614 bytesVBA/Module2
A5991 bytesVBA/Sheet1
A6991 bytesVBA/Sheet2
A7991 bytesVBA/Sheet3
A8991 bytesVBA/Sheet4
A9999 bytesVBA/ThisWorkbook
A104625 bytesVBA/_VBA_PROJECT
A112283 bytesVBA/__SRP_0
A12357 bytesVBA/__SRP_1
A13280 bytesVBA/__SRP_2
A14494 bytesVBA/__SRP_3
A15638 bytesVBA/dir
B176 bytesCompObj
B216209 bytesOle10Native
C176 bytesCompObj
C252941 bytesOle10Native
D1102 bytesCompObj
D262 bytesOle
D3256 bytesEquation Native
OLE vba

MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:

TypeKeywordDescription
AutoExecAuto_OpenRuns when the Excel Workbook is opened
Hex StringvVEFV7656454656
IOCSHELL32.dllExecutable file name
SuspiciousOpenMay open a file
SuspiciouswriteMay write to a file (if combined with Open)
SuspiciousKillMay delete a file
SuspiciousvbNormalMay run an executable file or a system command
SuspiciousrunMay run an executable file or a system command
SuspiciousShellExecuteAMay run an executable file or a system command
SuspiciousSHELL32May run an executable file or a system command
SuspiciousCreateMay execute file or a system command through WMI
SuspiciousGetObjectMay get an OLE object with a running instance
SuspiciousLibMay run code from a DLL
SuspiciousexecMay run an executable file or a system
SuspiciousHex StringsHex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)
SuspiciousBase64 StringsBase64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence

File Origin
# of uploads :
1
# of downloads :
75
Origin country :
n/a
Vendor Threat Intelligence
Verdict:
Malicious
File type:
application/vnd.ms-excel.sheet.macroEnabled.12
Has a screenshot:
False
Contains macros:
False
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/118461/
Detection(s):
SecuriteInfo.com.VBS.Agent-25.UNOFFICIAL
Create hunting rule

Sanesecurity.Badmacro.Xls.ObjResp.UNOFFICIAL
Create hunting rule

MiscreantPunch.EvilDoc.Exploit.2017-11882.M3.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Launching a process
Creating a process with a hidden window
Running batch commands
Launching the default Windows debugger (dwwin.exe)
Running batch commands by exploiting the app vulnerability
Launching a process by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
OOXML Excel File with Embedding Objects
Link:
https://app.docguard.net/bd4f44ebdc75f53514f780516dfcb2c0a70f0fcec4d964a75fde9373bd51907e/results/dashboard
Result
Verdict:
MALICIOUS
Details
Macro with Startup Hook
Detected macro logic that will automatically execute on document open. Most malware contains some execution hook.
Base64 Encoded URL
Detected an ANSI or UNICODE http:// or https:// base64 encoded URL prefix.
Macro with DLL Reference
Detected macro logic that will load additional functionality from Dynamically Linked Libraries (DLLs). While not explicitly malicious, this is a common tactic for accessing APIs that are not otherwised exposed via Visual Basic for Applications (VBA).
Document With No Content
Document contains little or no semantic information.
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
expl.evad.troj
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/614885
Signature
C2 URLs / IPs found in malware configuration
Document contains an embedded macro with GUI obfuscation
Document contains an embedded VBA macro which may execute processes
Document contains an embedded VBA macro with suspicious strings
Document contains an embedded VBA with functions possibly related to ADO stream file operations
Document contains an embedded VBA with many string operations indicating source code obfuscation
Document exploit detected (creates forbidden files)
Document exploit detected (process start blacklist hit)
Found malware configuration
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
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Sigma detected: Microsoft Office Product Spawning Windows Shell
System process connects to network (likely due to code injection or exploit)
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to detect virtualization through RDTSC time measurements
Yara detected AntiVM_3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 356467 Sample: proposal.xlsm Startdate: 23/02/2021 Architecture: WINDOWS Score: 100 45 www.tyats.com 2->45 59 Found malware configuration 2->59 61 Malicious sample detected (through community Yara rule) 2->61 63 Multi AV Scanner detection for submitted file 2->63 65 11 other signatures 2->65 13 EXCEL.EXE 15 26 2->13         started        signatures3 process4 file5 41 C:\Users\user\Desktop\~$proposal.xlsm, data 13->41 dropped 79 Document exploit detected (creates forbidden files) 13->79 81 Document exploit detected (process start blacklist hit) 13->81 83 Microsoft Office drops suspicious files 13->83 17 cscript.exe 3 13->17         started        signatures6 process7 dnsIp8 43 canfilters.servehttp.com 80.85.153.145, 443, 49711 CHELYABINSK-SIGNAL-ASRU Russian Federation 17->43 20 windows.exe 3 17->20         started        23 conhost.exe 17->23         started        process9 signatures10 67 Tries to detect virtualization through RDTSC time measurements 20->67 25 windows.exe 20->25         started        process11 signatures12 69 Modifies the context of a thread in another process (thread injection) 25->69 71 Maps a DLL or memory area into another process 25->71 73 Sample uses process hollowing technique 25->73 75 Queues an APC in another process (thread injection) 25->75 28 explorer.exe 25->28 injected process13 dnsIp14 47 strangelectric.net 198.54.116.171, 49713, 80 NAMECHEAP-NETUS United States 28->47 49 sportsfm104.info 143.95.91.230, 49712, 80 ASMALLORANGE1US United States 28->49 51 2 other IPs or domains 28->51 77 System process connects to network (likely due to code injection or exploit) 28->77 32 wlanext.exe 28->32         started        35 autochk.exe 28->35         started        signatures15 process16 signatures17 53 Modifies the context of a thread in another process (thread injection) 32->53 55 Maps a DLL or memory area into another process 32->55 57 Tries to detect virtualization through RDTSC time measurements 32->57 37 cmd.exe 1 32->37         started        process18 process19 39 conhost.exe 37->39         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/bd4f44ebdc75f53514f780516dfcb2c0a70f0fcec4d964a75fde9373bd51907e/
Threat name:
Document-Office.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2021-02-23 06:59:17 UTC
AV detection:
20 of 47 (42.55%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=xvhuj264ox2tkfhxqbiw37fsyctq6d6oytmwjj2732jxhpkrsb7a._file
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook rat spyware stealer trojan
Link:
https://tria.ge/reports/210223-v71laal9xj/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Launches Equation Editor
Modifies Internet Explorer settings
NTFS ADS
Script User-Agent
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
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
Suspicious use of SetThreadContext
Blocklisted process makes network request
Executes dropped EXE
Formbook Payload
Formbook
Process spawned unexpected child process
Malware Config
C2 Extraction:
http://www.foodhallhilversum.com/c2m8/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Legit
Score:
0.21
Link:
https://yomi.yoroi.company/submissions/bd4f44ebdc75f53514f780516dfcb2c0a70f0fcec4d964a75fde9373bd51907e

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: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.

Malspam

Formbook

Excel file xlsm bd4f44ebdc75f53514f780516dfcb2c0a70f0fcec4d964a75fde9373bd51907e

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/118461/

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