Office (OOXML) / .XLSM malware analysis — malicious · 8d18d6cd77cde07f

MALICIOUS

Office (OOXML) / .XLSM

438.4 KB Created: 2021-07-28 10:37:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 7b0674dbd3c991f34940e8da20edcda9 SHA-1: d21523e58a4be815063b95ac424b5d4c2be719c3 SHA-256: 8d18d6cd77cde07f6bde057ace8a45430c545826e0d7eb849f201233681fa0c1

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample is an XLSM file containing a Workbook_Open macro that executes a payload. The macro reconstructs the path "C:\Users\Public\Trendline.exe" using Environ() and cell values, then uses CreateObject to execute it. This indicates a macro-based downloader designed to run a second-stage payload.

Heuristics 5

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.
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` `7441f6e094f7b5387a184e456dae35e4f2806e011e9be84d349673274a9a2adc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1124 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` `67a6ce9eadf9e1bd75281612bc26b33b9ed8973ba8ee3958b8bd9765041896c8`	vba-project	OOXML VBA project: xl/vbaProject.bin	9216 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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