Office (OOXML) / .XLSX malware analysis — malicious · 3de85e491fb06b4c

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: f230e1ec29f642b2e7e0dc60b7446511 SHA-1: 6cfdbc6e9a08461e30018abb276017615540c736 SHA-256: 3de85e491fb06b4c66781b39dea7349b590012c8e08ce5c3badecbaac6bd71df

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1059.005 Visual Basic

The file contains a Workbook_Open macro that executes obfuscated PowerShell commands. These commands attempt to download and execute a second-stage payload from multiple URLs, including 'http://harperhouseproducts.com/Merchandise2/ARSf1LIcOauh1rDi/A'. The script also attempts to write a VBS file to 'c:\programdata\yhjlswle.vbs' and a BAT file to 'c:\programdata\ughldskbhn.bat'. The ClamAV detection name 'Xls.Downloader.EmotetRed02221-9938910-0' further supports its nature as a downloader.

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` `daa187de94bd890d56a0bf90828ac5ed74234540c1fb0c37669d12279e41967c`	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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