Office (OLE) / .XLSX malware analysis — malicious · 0805ca5c20d20d27

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: d043493015879e74a907ca609499e22d SHA-1: 3b29b86323891b0ebb7960b1a22c0c236d757eb2 SHA-256: 0805ca5c20d20d270c9ac8cdd9f141ebfb0b9e31453be464ee5ee47b0dda0adc

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample is a malicious Excel file containing VBA macros. The Workbook_Open macro executes a series of commands, including the creation of a batch file at 'c:\programdata\jledshf.bat' and the execution of a VBScript from 'c:\programdata\wetidjks.vbs'. This script appears to download and execute a second-stage payload from a list of URLs, including 'http://aixyana.com/wp-admin/6pY001tdOxYb10/'. The use of CreateObject and Wscript.Shell indicates the intention to leverage Windows Script Host for execution.

Heuristics 6

ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
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` `c49f2df77c50e10269216d97c3efdf7c32f9f18ba5d8fd42a9b144f48e100040`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	5709 bytes

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