Office (OOXML) / .XLSM malware analysis — malicious · e2e2be12dceaf6d5

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: a084fa09d3d94c642d25be26b20be31f SHA-1: b93c2ebae4b5143108f4eae36a2800920d7337b4 SHA-256: e2e2be12dceaf6d5f7da257d110b4cb4a0615aa59ac2729095fc87a49d6ab936

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. It reconstructs a path from environment variables and cell values to write a second-stage payload to 'C:\Users\Public\Documents\IAccessible2Proxy.exe' and then executes it. The macro also attempts to establish persistence by writing to the Run key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy'.

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` `3db30610741e022807e7da2d6fb1eaa25dc1ff22782881e099723a7d9f95c7e1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1142 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` `b85800e7199a0d5e5f140206d633fffa32cb20e0895e105b49a0c2f54ebcaca0`	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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