RTF malware analysis — malicious · efcfb4bd93265f9f

MALICIOUS

RTF

282.2 KB

MD5: b9a5ea9d3cab85c427bc974a5cff015f SHA-1: 67e5a0fddfa6980437cbccfa7359beb3e3138f69 SHA-256: efcfb4bd93265f9f61844a67594aa17f3e2c8fdc1bbe995c5aa35b10a754f521

180 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The RTF document contains multiple OLE objects, including one that triggers an objupdate directive, indicating an attempt to activate embedded content. The document body explicitly instructs the user to 'Enable Editing', a common lure for macro-based malware. The presence of OLE object data and composite monikers suggests the embedded object is designed to execute code, likely a downloader or dropper. No scripts were extracted, but the heuristics strongly indicate a malicious OLE object designed to bypass security controls.

Heuristics 7

Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF contains 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM

RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Suspicious extracted artifact medium 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000b44.bin` `3f4d6ce442be57b67a31e653fe19c5460746410ae0acce46e7acc13ef765f331`	rtf-objdata-decoded	RTF \objdata at offset 0xB44	48415 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s).
`objdata_01_off00018687.bin` `12289ea42203fe86d5d6e86e52672f752ead5709842d0443203b40a4917d5ece`	rtf-objdata-decoded	RTF \objdata at offset 0x18687	12261 bytes
`objdata_02_off0001e699.bin` `5de732ece55617b212baa0db7102c497ed7e809d372953a6a31ff14adb5754f5`	rtf-objdata-decoded	RTF \objdata at offset 0x1E699	2632 bytes

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