Office (OOXML) / .XLSM malware analysis — malicious · ed1a88a3870638b6

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 03e9e10141a901bf7e0759db36bb0ae9 SHA-1: ac31385d44605b857e07eba833260d7a93f665a7 SHA-256: ed1a88a3870638b600a35c8d8ca06e5ce99276dd4b50edb3b41014911f875594

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. This macro uses CreateObject to execute a command. The command is constructed by concatenating environment variables and cell values, which resolves to 'C:\Users\Public\Documents\IAccessible2Proxy.exe' and writes it to a file. This file is then executed. The macro also attempts to establish persistence by writing to the registry 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` `e0ab48a506f9306a1c372d070120e55daa196fbb789020af49790d253b9ba6f0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1065 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` `bd10307b3694013a05d0ad7cad6a4f0f281b2dac0c46dc59370b976d651ca720`	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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