Office (OOXML) / .XLSX malware analysis — malicious · fd31208b16313584

MALICIOUS

Office (OOXML) / .XLSX

14.3 KB Created: 2020-05-17 21:48:22 UTC Authoring application: Microsoft Excel 15.0300

MD5: 4dd4dc761a24b633fe5c5f43308630ee SHA-1: 3df501643cde0bb93b35575610e49f30aef36f3e SHA-256: fd31208b16313584d805bc9ab81f1f74ed7dd9176e81c2e029d7dce4831cf833

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The presence of a Workbook_Open macro indicates that malicious VBA code will execute automatically when the Excel file is opened. The CreateObject heuristic further suggests that the macro is likely attempting to execute arbitrary code or download a second-stage payload. No specific family could be identified from the static analysis.

Heuristics 4

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` `a7a6b8f5647bf2adcde4fdc417f5376c561b074ae9c2c8c4dfbd138b3acc2c06`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3265 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` `5ddc5f6d61bf6fad819d18d28ad8d0b2d01abe9ec2bb939fe7434ce541a519b8`	vba-project	OOXML VBA project: xl/vbaProject.bin	18432 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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