Office (OOXML) / .XLSX malware analysis — malicious · 5000f900d0d52fb1

MALICIOUS

Office (OOXML) / .XLSX

17.4 KB Created: 2021-08-06 12:21:12 UTC Authoring application: Microsoft Excel 15.0300

MD5: 98d926593ca28b2b418fb4208b374c9c SHA-1: 7bb0d46b6a36833178180c57b35c2b2bee02eb36 SHA-256: 5000f900d0d52fb1b6634d0437711ab10c9184d080c852f17b2fb114a35446a8

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The sample is an Excel document containing a Workbook_Open macro, which is a common technique for executing malicious code upon opening. The macro attempts to construct and execute a PowerShell command. The script concatenates several strings to form the command 'powershell.exe', indicating an attempt to download and execute a second-stage payload. The presence of a Workbook_Open macro and the execution of PowerShell are strong indicators of malicious intent.

Heuristics 4

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` `61f8e229247359f048b27d26edfd005606474198f539e307a5384c831a82ae1a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	6332 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `190e515334924bfea93617150775be9644bef6425cf237d6eabe9abb16fa442e`	vba-project	OOXML VBA project: xl/vbaProject.bin	22016 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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