Office (OOXML) / .XLSX malware analysis — malicious · f026659380293aeb

MALICIOUS

Office (OOXML) / .XLSX

25.1 KB Created: 2021-02-25 21:20:17 UTC Authoring application: Microsoft Excel 16.0300

MD5: d68eb2a0c4ef9306e93e7f993544bbfe SHA-1: a503bfdf64589003faeee0857cb9808fdc659dea SHA-256: f026659380293aebc45bc97cd4aeee19c96e8ae5b88673283f2ed113bed4110f

408 Risk Score

Malware Insights

MITRE ATT&CK

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

This XLSX file contains VBA macros that are triggered automatically upon opening (AutoOpen, Workbook_Open). The macros heavily utilize WScript.Shell and the Shell() function, with evidence of obfuscated commands containing URLs. This indicates the script's intent is to download and execute a second-stage payload. The specific family is not identifiable from the provided heuristics.

Heuristics 11

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)
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
- http://schemas.microsoft.com/office/spreadsheetml/2014/revision
- http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `23a83b1c11736622e35c7bc6e641d63bf912db1ba6a23108949c10e8e7774024`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	11668 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` `6aba370e6a8ba938321694f26267a7ede2ce0daea750293c9193b9c59138a991`	vba-project	OOXML VBA project: xl/vbaProject.bin	49152 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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