Office (OOXML) / .XLSM malware analysis — malicious · 238c4b5e565bdf5b

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 79a813bfdb53aa8ee5aaec0454decefc SHA-1: c612534135ac48a3798c20ff371d1b5d3b0efa74 SHA-256: 238c4b5e565bdf5bc728748cececf19eba8d4967c373f9659968fd58fd239806

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an XLSM file containing a Workbook_Open macro, indicating an attempt to execute code upon opening. The macro uses CreateObject to execute a command, reconstructing the command from environment variables and cell values. The reconstructed command is 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy', suggesting the malware attempts to establish persistence. The script's obfuscated nature and reliance on cell values make precise payload identification difficult, but the overall intent is to download and execute a second-stage payload.

Heuristics 5

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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `f127957cac5a783ff6360c4e9670368bb7f0d2e582a12a8283a621cb1d81084d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1180 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` `6a159790a9cac7e0442cb5670aeaaf0986378c1e813c7458e592da2e50687818`	vba-project	OOXML VBA project: xl/vbaProject.bin	9216 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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