Office (OLE) / .XLSX malware analysis — malicious · 717dfc26ac3594b7

MALICIOUS

Office (OLE) / .XLSX

400.0 KB Created: 2020-09-28 08:20:53 Authoring application: Microsoft Excel

MD5: 81db51a6f1882bbddcd7a488036cd4bf SHA-1: 0ba8861c4517560919b5a099b4a7b1308609dd5f SHA-256: 717dfc26ac3594b79b3f5d4977bfbf8b56751422dc3dc464adc5e7c87dca5c08

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The Workbook_Open macro is obfuscated and uses CreateObject to download a file from the URL "http://192.236.154.183/EW/FGI-07199.jpg" and execute it. This indicates a downloader functionality, likely to fetch and run a second-stage payload.

Heuristics 5

VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `b3fb13fab0e7ef48364d71fb0297201cc39e1e379e5a86130d34a79aca76fde2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6021 bytes

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