Office (OOXML) / .XLSX malware analysis — malicious · 9a84b8b7c27da75c

MALICIOUS

Office (OOXML) / .XLSX

92.0 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000

MD5: 5d14b038e7c011a378cb262dad9f551f SHA-1: aac16b5df3c8ceb2cfe0e33ec1b06195b526cfdb SHA-256: 9a84b8b7c27da75c9a3f9eb544ff27a06c4d39f432093b641881e57bded50e19

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel document containing a Workbook_Open macro, which is a common technique for executing malicious code upon opening. The macro utilizes CreateObject to instantiate Wscript.Shell, and the DOC BODY excerpt reveals commands that attempt to download and execute a VBScript from a hardcoded URL. The script is designed to download and execute a second-stage payload, as indicated by the reconstructed URL 'http://harperhouseproducts.com/Merchandise2/ARSf1LIcouhH1rDiRh/'. The ClamAV detection further confirms its malicious nature.

Heuristics 5

ClamAV: Xls.Downloader.EmotetRed02221-9938910-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetRed02221-9938910-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `de7bcbc45ff0a77d05d9af662bacc316e71be11a980e94f6673e556a5dd9d1bc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12808 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `1631f895b37ee24c02c1c0db04c4310a7cec9cebd03559392c5e06b1b593fd71`	vba-project	OOXML VBA project: xl/vbaProject.bin	37888 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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