Office (OLE) / .DOCX malware analysis — malicious · 1e881211728bea5b

MALICIOUS

Office (OLE) / .DOCX

205.5 KB Created: 2020-05-15 00:06:00 Authoring application: Microsoft Office Word

MD5: 65dfa26a63d882f41f0c1e00d3473d7c SHA-1: 89a7710b14d9e3eaa71acd267b88e0f0859ad5fb SHA-256: 1e881211728bea5bfd2dbcab2a6134d7da28864e8657334604e0de3242e33a9b

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a malicious Office document containing VBA macros. Heuristics indicate the use of 'certutil' for downloading and decoding, a common technique for fetching second-stage payloads. The presence of a heap spray pattern and NOP sled suggests exploitation of a memory corruption vulnerability. The ClamAV detection name 'Ole2.Macro.Agent' further supports its malicious nature as a macro-based agent.

Heuristics 9

ClamAV: Ole2.Macro.Agent-9858864-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Ole2.Macro.Agent-9858864-1
Heap-spray pattern detected high SC_HEAP_SPRAY

Repeated 0x41 (A) bytes found
Reference to certutil (download/decode) high SC_STR_CERTUTIL

Reference to certutil (download/decode)
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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.
NOP-equivalent sled detected medium SC_NOP_EQUIV_SLED

Long run of 0x41 bytes
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
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` `bc699709a267b6acee8961e84fae49e550ede2532aae690b8bb19185d019353f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2107 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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