Office (OOXML) / .XLSM malware analysis — malicious · ff86cc4d709607da

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 00dd2bb5ff77f25cdead45cfc8925bdf SHA-1: 6d63827217fcc835d1f5c50118b2da0a78085c8c SHA-256: ff86cc4d709607da760aae7a271bef0946512d5eb272e4fd9d170e7999a3ac00

148 Risk Score

Malware Insights

MITRE ATT&CK

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

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 constructed from environment variables and cell values. Specifically, it appears to be writing data to a file and then executing it, likely to download and run a second-stage payload. The use of Environ() and CreateObject are common techniques for obfuscation and execution.

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` `623376caaa3cf153f666b9822ef2afb1636eb9a46dba72fe2d1c2b9ddf32b5e8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1156 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` `0a27b577c8b233d35e61366ffc68aaea59f0d546c4f96897a6e39a8bffd8e95d`	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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