Office (OOXML) / .XLSM malware analysis — malicious · 7fe87c98f71cb7cf

MALICIOUS

Office (OOXML) / .XLSM

154.5 KB Created: 2021-03-26 05:57:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 9a30f275af39b20ce59988b3c1724a68 SHA-1: d35c17ba0c5f09cb212e0a50d117b91d278ec6b3 SHA-256: 7fe87c98f71cb7cfad4b7713284b7cfe1a0a5e059d5eb5e2c1b322426a6e52ff

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML file contains VBA macros, specifically a Workbook_Open macro that utilizes the Shell() function to execute arbitrary code. This indicates a downloader or dropper functionality, aiming to execute a second-stage payload. The presence of VBA macros and the Workbook_Open event are strong indicators of malicious intent.

Heuristics 5

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
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` `c7a500794bbdcaff6abf5d6c6790e9d1d184ca37832531168c31dca60a651c99`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	25581 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `b2dffc429f8db0dc127e2f601484531c6d6443a4d31a8c9a41f99d754ce3f98e`	vba-project	OOXML VBA project: xl/vbaProject.bin	36864 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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