Office (OOXML) / .XLSX malware analysis — malicious · 4f43f9b5de8e532a

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 332fd3985922abed9187950c475f4483 SHA-1: 915935872f62bf1a931be87525dd89d909e648f5 SHA-256: 4f43f9b5de8e532a4c7f31df433fd2c5d9d66e269247a1181c8345d36bb058ad

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 API, likely to download and execute a second-stage payload. The obfuscated function names and string concatenation in the script indicate an attempt to evade detection. The specific command constructed is 'ping google.com;' followed by content from cell (2,7), which is then passed to ShellExecute.

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` `f1dde680b9ce8d286e10f5741d93d00ee96ce6d909f3f4adb5e561b5473f0e35`	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` `9a7d1c131683aba257e109d0ce7a4fc5f8d995d34c193ea97525645f2bd583d1`	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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