Office (OOXML) / .XLSX malware analysis — malicious · cd5209c2bf2fb579

MALICIOUS

Office (OOXML) / .XLSX

212.8 KB Created: 2000-04-13 21:48:14 UTC Authoring application: Microsoft Excel 12.0000

MD5: c047ef35f2f87572d66d001be1343548 SHA-1: 9973626f45750bfba0323235f165c2e11079dcef SHA-256: cd5209c2bf2fb57926f9352d61b2ea69ea4e5732b1113224e98a8f5514d894d0

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter T1566.001 Phishing T1071.001 Just-in-Time Deployment

The file exhibits several indicators of malicious behavior, including a VBA-enabled workbook, a `Workbook_Open` macro that executes upon opening, and the creation of COM objects (likely for downloading and executing a payload). The `macros.bas` file contains a `Workbook_Open` subroutine that triggers upon opening the document. This suggests a macro-based downloader attempting to establish a foothold. The `CreateObject` calls further support this, as they are commonly used to instantiate tools for network communication and file manipulation. The presence of a VBA project file (`vbaProject_00.bin`) indicates a deliberate attempt to obfuscate the malicious code.

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` `0ab40cd7e090b48eb83ce3be0858860109fa0029d73718ec7f10612eba929eea`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3564 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` `1ff2a15af49c34ce94990102eb13cf0f1b9eeb2a1a421c617c1722a389a582cf`	vba-project	OOXML VBA project: xl/vbaProject.bin	16384 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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