Office (OOXML) / .XLSM malware analysis — malicious · a992a7369f3f33df

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 4bed818523217a9a80f41217bb763293 SHA-1: 8364190c76d04b8fefe21e27053512ff1373ac5f SHA-256: a992a7369f3f33df21de12a78754372b453a9da0d4d937ecf6adfd698be8308b

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 it's designed to execute code upon opening. The VBA script uses `CreateObject` to execute a file path constructed from environment variables and cell values, likely downloading and running a second-stage payload. Specifically, it appears to construct the path `C:\Users\Public\IAccessible2Proxy.exe` and execute it. The `Environ()` call suggests it may be attempting to retrieve dynamic paths or values, and the `CreateObject` call with a string literal that reconstructs to `WScript.Shell` is used to execute the constructed file path.

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` `56d138fef4cead20f86cc85a2c8c0edcc349f969b4f10167cf26c03a0a530592`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1140 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` `374b91a7f8bd76d5d3e2a668506db21567bc74c7055f517f7214a6f9db0f73ad`	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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