Office (OLE) malware analysis — malicious · b745c1e7d1a76781

MALICIOUS

Office (OLE)

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

MD5: 7d3973e50fa19997eea5011ff85bb3ee SHA-1: 20ecb0f7328ab6f7f0ca5b0e0b5510c690126bc6 SHA-256: b745c1e7d1a767819af8d95159f3805cc6d4a07a2dc95644101e334582edbbd2

240 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains a malicious VBA macro that executes upon opening the document. The macro is designed to create and execute a second-stage payload named 'update.exe' in various common locations, including persistence mechanisms like the Run key. The script also attempts to establish persistence by copying the payload to startup folders and the system directory.

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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