Office (OOXML) / .XLSX malware analysis — malicious · 46780e7bfb274c86

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: eb8c5312d108021529e0ba32d5bdb9e6 SHA-1: 37753dcf345bcdc6a13d6251f4bdedcea0d39b16 SHA-256: 46780e7bfb274c863e8633411a47161fc1426dea0eee25c3774b27d6cc84cd79

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell

The file contains a Workbook_Open macro that executes obfuscated commands. These commands attempt to download and execute a VBScript payload from multiple URLs, including 'http://harperoproducts.com/Merchandise2/ARSf1LIcOauH1rDiH/'. The presence of CreateObject calls and the ClamAV detection signature 'Xls.Downloader.EmotetRed02221-9938910-0' strongly indicate a downloader functionality.

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` `77fca0b3fac40aff1b626808048663589e5dfc62894d9d283c33bddec4afffd8`	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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