Office (OOXML) / .XLSX malware analysis — malicious · cdc0a4035c420d08

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 53b4ab55bf55f88b70f50741b6833256 SHA-1: dec5d847018013f585fa5d445cef1bba68693f24 SHA-256: cdc0a4035c420d0815fa1e7c65731eabfcda0ab41eb21bf529491528813d34ba

200 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains a Workbook_Open macro that executes a series of obfuscated commands. These commands appear to reconstruct a PowerShell command that downloads and executes a second-stage payload from multiple URLs. The presence of the ClamAV detection for 'Xls.Downloader.EmotetRed02221-9938910-0' strongly suggests a downloader functionality. The reconstructed PowerShell command includes several potential download URLs and specifies saving files to 'c:\programdata\yhjlswle.vbs' and '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` `42d85c89ab52435ceee3ff24d15c909207a34033447d62e4548ce6c6c3c3c9aa`	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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