Office (OOXML) / .XLSX malware analysis — malicious · 53137308efe035c9

MALICIOUS

Office (OOXML) / .XLSX

13.0 KB Created: 2021-02-18 19:18:45 UTC Authoring application: Microsoft Excel 16.0300

MD5: 76e5e0e105621ba28d8343039ef3b37b SHA-1: afbd310f7a94e58b8e8fa0c6c37872be4c6cf1c9 SHA-256: 53137308efe035c9d5e35063651eb16a2b47d79e975daf1dd65ad19a06dac5de

320 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1218 System Binary Proxy Execution

The OOXML file contains VBA macros, specifically triggering AutoOpen, Workbook_Open, and Auto_Open events. These macros reference cmd.exe and a LOLBin, indicating an attempt to execute arbitrary commands. The primary goal appears to be downloading and executing a second-stage payload.

Heuristics 8

LOLBin reference in VBA critical OLE_VBA_LOLBIN

LOLBin reference in VBA
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
GetObject call high OLE_VBA_GETOBJ

GetObject call
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
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` `5d6a318201bde34d7d8ed33ef085e04cad62e92a5f3bc8562c2905814cd5f721`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1135 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `7b1d7a96e239712cc069fcefad4d0ab7ca2b182cab9bc5121b0e61d2f0e88c7a`	vba-project	OOXML VBA project: xl/vbaProject.bin	15360 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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