Office (OOXML) / .XLSX malware analysis — malicious · 8812fc1bd832fce6

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 3a49de10790aa214ecfc8198797afae9 SHA-1: cc441935dc98507d0f560b1e7af228de5b7f04c9 SHA-256: 8812fc1bd832fce688472db7aee5792463bb2b3667441f21cdb5139c08bc293a

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter T1071.001 Application Layer Compromise T1566.001 Phishing T1071.002 Remote Services - SMB

The file's metadata and heuristic firings strongly indicate the presence of VBA macros within an OOXML document. The `Workbook_Open` macro triggers upon document opening, and the `CreateObject` call suggests the use of COM objects for potentially downloading and executing a payload. The extracted macro code attempts to establish a connection to a remote host, likely for command and control or payload delivery. The obfuscated nature of the macro and the use of `MsgBox` for error handling further suggest malicious intent.

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` `d2b6a88380ec985a0b0f73bbd79b6f23ab91e264c927cd01c8696d4558a9c382`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3584 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` `18c2e74fc6b10058cdfc23ac971527894744116a1e8360a74d7dd28c36497042`	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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