Office (OOXML) / .XLSX malware analysis — malicious · 9bca97c3be5d93a9

MALICIOUS

Office (OOXML) / .XLSX

19.5 KB Created: 2021-02-18 18:55:41 UTC Authoring application: Microsoft Excel 16.0300

MD5: 501ea495deedd8986d7ffa13acecb499 SHA-1: 404c58cf3bfe7191e685ec2966ab91968698fbbd SHA-256: 9bca97c3be5d93a9d10b1f1ed2a22db889e866e0ae5046ca7079c5c92eb09982

408 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The file is an Excel spreadsheet containing VBA macros that are triggered by Workbook_Open. Critical heuristics indicate the use of WScript.Shell and the Shell() function, with one critical heuristic specifically noting an obfuscated VBA Shell command containing a URL. This suggests the macro's primary purpose is to download and execute a second-stage payload from a remote source. No document body text was available for analysis.

Heuristics 10

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL

VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
Auto_Open macro high OLE_VBA_AUTO

Auto_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` `436945c2d4ef92f963c380046bf2f532cb3bacf3ee33b3a1f930283966d7ee9e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	11710 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `dfd3e9f14e358ae84703c5127f6179341bb7aff0235a457dd96b08d21a48ac8a`	vba-project	OOXML VBA project: xl/vbaProject.bin	29184 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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