Office (OOXML) / .XLSX malware analysis — malicious · b1df072eba923c47

MALICIOUS

Office (OOXML) / .XLSX

152.7 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300

MD5: 61393cc2ed5c3e69c914089e2d1eafc2 SHA-1: a02fde6b411b6ba15322eb8c596be9d5d87a51c3 SHA-256: b1df072eba923c472e461200b35823fde7f8e640bfb468ff5ac707369a2fa35e

180 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel spreadsheet containing a Workbook_Open macro. This macro uses CreateObject and CallByName to invoke the ShellExecute method of the Shell.Application object. The script reconstructs the object name by removing spaces from 'Shell . Application' and the method name by removing spaces from ' S h e l l E x e c u t e '. The intent appears to be to execute a command, likely to download and run a second-stage payload, though the specific command is not fully reconstructible from the provided script.

Heuristics 5

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
CallByName call high OLE_VBA_CALLBYNAME

CallByName 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` `07880f041150861ee0432ab09a582875eca45dcb52541e8ff1e9ef89569f831a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1529 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` `57209b47360b6ae5a66d26f4ee77fc4e76c2f2eb14f60bd26ed5355cc5ccae5a`	vba-project	OOXML VBA project: xl/vbaProject.bin	15872 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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