Office (OOXML) / .XLSX malware analysis — malicious · b82f92b0468295e7

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 78e06d3b669fa31ec2190aa2b1f7f2ea SHA-1: 00138b9252183b25130ae9f2275012dd29c09eba SHA-256: b82f92b0468295e7bf7ec57ba178ce524b2f506fad94b6687ae5cb0cebb461ee

200 Risk Score

Malware Insights

MITRE ATT&CK

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

The file contains a Workbook_Open macro that executes obfuscated PowerShell commands. These commands are designed to download and execute a second-stage payload from multiple URLs. The presence of a Workbook_Open macro and the execution of PowerShell are strong indicators of malicious intent, likely for delivering further malware. The ClamAV detection as 'Xls.Downloader.EmotetRed02221-9938910-0' further supports this assessment.

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` `bf240ea04984addec98d44190bfecea682532108ed293c1c32e0ca4d5b7df3d9`	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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