Office (OOXML) / .XLSX malware analysis — malicious · a7bf09f0e448c426

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 89a78fbe45355cd4c6d1c40a7e06961a SHA-1: f395d69c35912e62967c75bbc6c0057e53382ce9 SHA-256: a7bf09f0e448c42699df1c4b3dce050a4a55f242e9168d0ecebadde2a9765d2d

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/Windows

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 a VBA project file. The macro's code attempts to instantiate COM objects (likely for downloading or executing commands), and the `CreateObject` call suggests an attempt to establish a connection to a remote server. The overall intent is to download and execute a secondary payload, likely a dropper or a remote access trojan. The `Workbook_Open` macro is a common technique for establishing persistence and initiating malicious activity within a compromised system.

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` `d0575974518ba4497a3f734a0434e68454d534c61d777c20ad2ac4b70aba0a79`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3488 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` `9d610c16a90c892aa73d13360a0c83ca90bfda8162e3535fbb3e45abe166e1fd`	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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