Office (OLE) malware analysis — malicious · 7ce5065ed73dd249

MALICIOUS

Office (OLE)

154.0 KB Created: 2020-09-15 04:19:00 Authoring application: Microsoft Office Word

MD5: 2431e687fdda16e48bde63377cb9d78b SHA-1: f463f923474c13e9cdd9c1ad708a23f76a0bea91 SHA-256: 7ce5065ed73dd24974e383c371aa018012389fcdd6a8ff9ba085e03d0c62f8b3

262 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell

The sample is a malicious Office document containing obfuscated VBA macros. The Document_Open macro triggers an obfuscated PowerShell stager, likely intended to download and execute a second-stage payload. The presence of CreateObject calls and the specific heuristic 'OLE_USERFORM_OBFUSCATED_POWERSHELL' strongly indicate this malicious behavior.

Heuristics 7

Hidden UserForm PowerShell EncodedCommand stager critical OLE_USERFORM_OBFUSCATED_POWERSHELL

OLE document contains a UTF-16LE form/property string with an obfuscated PowerShell -EncodedCommand payload. The observed macro family reconstructs this hidden string with Split/Join or UserForm property reads and launches it through WMI/COM process creation. This is downloader malware, not an Office CVE exploit.
ClamAV: Doc.Malware.Ewlu-9762397-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Ewlu-9762397-0
Document_Open macro high OLE_VBA_DOCOPEN

Document_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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `262eaa2cfabe15c408f9ed0f71f3e80b6e1636570aa2563811ecb34f68c15392`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22860 bytes

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