Office (OOXML) / .XLSX malware analysis — malicious · fbff49100ec05232

MALICIOUS

Office (OOXML) / .XLSX

20.0 KB Created: 2021-08-10 06:23:53 UTC Authoring application: Microsoft Excel 15.0300

MD5: 98c1aa48f8b9ba8eacfeeef180ad7ba1 SHA-1: bc0f6809993f02457a873a6306caded55382745c SHA-256: fbff49100ec0523290c80ae279c0202540c1f5e939e39c571cfc09e46bc012b0

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an Office document containing VBA macros, specifically a Workbook_Open macro that triggers obfuscated VBA code. Critical heuristics indicate the use of Shell() and WScript.Shell, suggesting the macro attempts to execute external commands or download and run additional malware. The VBA code is truncated, but the presence of these indicators strongly points to a downloader or initial execution stage.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `20dca33689867fb61e2caa30440632cff7741e5e8ccd4f0b168e59812e22a6a2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	8090 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 6 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `c33caa28d102a71888dd03ab8efc724db2db23c78909a5e9a55c616a353f5b10`	vba-project	OOXML VBA project: xl/vbaProject.bin	28160 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 6 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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