Office (OOXML) / .XLSM malware analysis — malicious · eff7ac42d7bfa472

MALICIOUS

Office (OOXML) / .XLSM

81.3 KB Created: 2020-10-17 22:36:00 UTC Authoring application: Microsoft Excel 16.0300

MD5: aad1efc2f86e148053fca1493944dce6 SHA-1: 23826d50ac0ed55ad1e184f40e26a03722c20143 SHA-256: eff7ac42d7bfa47292efe5fc6df8af629b8b993991bfbf27357af93fe3f3d953

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell

The OOXML file contains VBA macros, specifically a Workbook_Open macro that utilizes the Shell() function. This indicates the document is designed to execute arbitrary commands upon opening, likely to download and run a secondary payload. The presence of a long encoded blob within the extracted artifacts further supports this malicious intent.

Heuristics 4

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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` `c521d101be0cd05146f85d09f1985757c9f5b3e6537cfaf217fb509b65f2c23a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1939 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely 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` `5e0cdfed91361326316820256b38bae906020d640f3fcb4716ef9cb707c14526`	vba-project	OOXML VBA project: xl/vbaProject.bin	16384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

Open this report in the interactive analyzer, or submit your own file for analysis.