Office (OOXML) / .XLSM malware analysis — malicious · 41a6f78c0bc46d5d

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 1386920a939f80ca68247221e9739980 SHA-1: f45ce3a33981cdffdf8b37438f32a9c0b6c2cef0 SHA-256: 41a6f78c0bc46d5d5763ed7cf12d5330c2fb09c4270c2341cca1b57b25869b43

148 Risk Score

Malware Insights

MITRE ATT&CK

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

This XLSM file contains a Workbook_Open macro that executes a payload. The macro reconstructs a path to a file named 'IAccessible2Proxy.exe' in the user's public documents folder and a registry key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy' for persistence. It then uses CreateObject to execute this payload. The macro also appears to construct a string from cell values and write it to a file, though the exact content is not fully determinable from the provided snippet.

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` `5cbcf59aab66ac45f7b75c7bdf544ae1b2f498e5890aa3ab14903a17a42ea6ef`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1170 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` `c3eb8301d089a0c8e6e2cd1330888bf41e1be02d18b32917d00dedc1cb5ea517`	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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