Office (OOXML) / .XLSX malware analysis — malicious · 31eea9e3f6c5cb7d

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 84cf9cbee49913c8827409347c653103 SHA-1: 3a57ec3e731f38afc1ac477139603fed7b3ae650 SHA-256: 31eea9e3f6c5cb7dedb21ee8396fbcd7cd708301fe6c7789d777d78dc2bda942

200 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Excel document containing a Workbook_Open macro, a common technique for executing malicious code upon opening. The macro utilizes CreateObject to instantiate Wscript.Shell, which is then used to execute a batch command. This command appears to be constructing a PowerShell command to download and execute a VBScript payload from multiple URLs. The ClamAV detection name 'Xls.Downloader.EmotetRed02221-9938910-0' further supports its role as a downloader. The reconstructed command line indicates the download of a VBS file to 'c:\programdata\yhjlswle.vbs' and a batch file to 'c:\programdata\ughldskbhn.bat'.

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` `6a0929f18fe46452246c9967932fb5c786d95e475f47d297b4f174d77f210c47`	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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