Office (OLE) / .XLSX malware analysis — malicious · 14bdf4f6b19a915c

MALICIOUS

Office (OLE) / .XLSX

37.0 KB Created: 2021-05-24 08:22:49 Authoring application: Microsoft Excel

MD5: 6d403f82486fef48b1883e0f9a28726d SHA-1: ad81f5a3c502221732242dff36813047efb99414 SHA-256: 14bdf4f6b19a915c990311f85f8d82b9b4f3dd9d876ecc9b3ed69e65a4195cc2

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The Workbook_Open macro is heavily obfuscated and uses CreateObject to execute a PowerShell command. This command downloads and executes a second-stage payload from the URL 'http://185.173.171.135/payload.exe'. The obfuscated nature of the loader and the download-and-execute pattern are indicative of a malicious macro-based document.

Heuristics 5

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 p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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` `d9ffacadc1badf1bde5f9cb6bf2e7f0af243a2223a1713554adaeb2ae9ccc1d4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4533 bytes

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