Office (OOXML) / .XLSX malware analysis — malicious · c2fa8e507fd8eac7

MALICIOUS

Office (OOXML) / .XLSX

232.6 KB Created: 2021-07-29 07:45:06 UTC Authoring application: Microsoft Excel 16.0300

MD5: a59f482b3304890ef526694515853371 SHA-1: c2cfc323b1a90b4f77428a0634d2bae93d064e7b SHA-256: c2fa8e507fd8eac778c190c8841073a6dddb78789169df79f0445c4a19871c23

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1071.001 Web Protocols

The file is an Excel macro-enabled document containing a Workbook_Open macro. This macro calls obfuscated VBA functions that utilize WScript.Shell and CreateObject to likely download and execute a second-stage payload. The VBA code is heavily obfuscated, making it difficult to determine the exact payload or destination URL, but the presence of Shell() and WScript.Shell usage strongly indicates a downloader or dropper functionality.

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` `99170134429d406c0ea3f1a7242996eb3e80611a7f1a9674424e07d004a3ddcf`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	5157 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 4 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `1ce474312d4121569bc920d276c3928355c410806be4ccd578875b581fd6dc7d`	vba-project	OOXML VBA project: xl/vbaProject.bin	37888 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 4 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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