RTF / .DOC malware analysis — malicious · ef5b81d7eebf08ed

MALICIOUS

RTF / .DOC

1.02 MB

MD5: fef57f1f8bc2bc336fa0fe4f1d5e3f30 SHA-1: c0169f4d359c5e889d6dc19a3559e1a4dd8bacc8 SHA-256: ef5b81d7eebf08ed869799e9022ca82ff0a5c781b72bb6652fbc1fe7f0e4ebcc

220 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains multiple embedded OLE objects, with high-confidence heuristics indicating automatic linking and update activation. A lure to enable macros or editing is present, suggesting the document is designed to trick the user into activating the embedded objects. These objects contain large amounts of hex-encoded data, likely hiding a payload that is executed upon activation. The specific mechanism for payload execution is not detailed, but the overall pattern points to a downloader.

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1037KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 4 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000bad.bin` `4ff8db8c127d3d211a7ba885cca68d0862b10092a8a79c1767222ac295ed2002`	rtf-objdata-decoded	RTF \objdata at offset 0xBAD	408296 bytes
`objdata_01_off0000735c.bin` `026defd18704019c70c39854424774167369985696febe504b1c023905c27c61`	rtf-objdata-decoded	RTF \objdata at offset 0x735C	408269 bytes
`objdata_02_off000d692d.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0xD692D	2632 bytes
`objdata_03_off000d7ed0.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0xD7ED0	12297 bytes

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