Office (OOXML) / .XLSM malware analysis — malicious · b20acc39c72c325d

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 31d05e3e192ccfc33a723d367448bccc SHA-1: 6f73884f439336d072f4dce3ba1e0b59e9430648 SHA-256: b20acc39c72c325d68947a75437601073048276f1b4b2ed712b22b048a5a43fe

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 constructs a path to a file named 'IAccessible2Proxy.exe' in the user's public documents folder and a corresponding registry Run key for persistence. It then uses CreateObject to execute this constructed path, likely downloading and running a second-stage payload. The specific payload and its ultimate destination are not directly extractable from the provided script, leading to a slightly reduced confidence.

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` `5449c0addaf45d19d4b23ef37472ef7701f54cdbaffeb8b4f2d29bd3982d143d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1135 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` `e24df534c24357834d209cab6ea07e7ff860bb2ffc60a91a6aaa8a7e4e06793a`	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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