Office (OOXML) / .XLSX malware analysis — malicious · 23219c81348cc3d6

MALICIOUS

Office (OOXML) / .XLSX

19.1 KB Created: 2021-03-23 08:33:53 UTC Authoring application: Microsoft Excel 15.0300

MD5: b4cf2053d95d4fbfc4b28083e509ff47 SHA-1: 86c621f576a92616faa8554cf63b7fa3988aaf61 SHA-256: 23219c81348cc3d6263f92edb8c450b6fc4e23f29749c0e00fb8575e25e8221f

268 Risk Score

Malware Insights

MITRE ATT&CK

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

The XLSX file contains a Workbook_Open macro that utilizes WScript.Shell and CreateObject to execute a shell command. This command likely downloads and executes a second-stage payload from the URL http://45.14.226.221/cdfe/Fack.jpg. The presence of the Workbook_Open macro and the Shell() call strongly indicate a malicious intent to compromise the user's system.

Heuristics 7

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.

URL http://45.14.226.221/cdfe/Fack.jpg
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` `8faffc39104a19e5b2f4ad523ecd362682e70674229de623a7b95f5d652aa675`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	7721 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` `444ce7892db7a012d45c4d1bf3ea25fbb91a092ee5353f7177b7d001836a095e`	vba-project	OOXML VBA project: xl/vbaProject.bin	24576 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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