Office (OLE) malware analysis — malicious · c5f07058041e375f

MALICIOUS

Office (OLE)

155.3 KB Created: 2020-09-15 06:22:00 Authoring application: Microsoft Office Word

MD5: fb8fd466f5cf6e01f63d7a1230080e3a SHA-1: ad1438bd23bb43a40c7fdb4debfc34cddafcfccf SHA-256: c5f07058041e375f500049607be83dcdfe83305ce54d6a921015259648642c66

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an OLE document containing a large VBA macro. Heuristics indicate the presence of a Document_Open macro that uses CreateObject to execute code. This macro likely downloads and executes a second-stage payload from the reconstructed URL 'http://schemas.openxmlformats.org/drawingml/2006/main'. The ClamAV detection and suspicious extracted artifact further support malicious intent. The macro also appears to establish persistence by writing to the Run key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy' and dropping an executable at 'C:\Users\Public\Application Data\Microsoft\Windows\ws.exe'.

Heuristics 7

ClamAV: Doc.Malware.Ewlu-9762385-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Ewlu-9762385-0
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.
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 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` `0812334775ad413ac951a2705cc110a8397311927e3a75099eb95d4d59503241`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	23048 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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