RTF / .DOC malware analysis — malicious · c50fe0ef4786784c

MALICIOUS

RTF / .DOC

386.4 KB

MD5: 89506665c96ef8d046c08113afb03319 SHA-1: f6f086b6a569967423a971b8e829f794ba849084 SHA-256: c50fe0ef4786784c914dd3b47b450073c9dfb1157154fd004c4db2b82d19ddbd

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple embedded OLE objects, with specific heuristics indicating the use of \objupdate and Composite Monikers, strongly suggesting an exploit targeting OLE object activation. One of the extracted artifacts, objdata_00_off000007d1.bin, is flagged as suspicious due to script execution terms. This points to a delivery mechanism designed to trick the user into activating the embedded object, leading to the execution of malicious code.

Heuristics 5

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
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_off000007d1.bin` `97f57c065ccca6c38537db20e7d5ee273277f0a46ee26146565c3d875eb596b1`	rtf-objdata-decoded	RTF \objdata at offset 0x7D1	98857 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00032ba4.bin` `7a8598fff434e2b582d3d87e32bb1d356d28f288618d4b03cf39e56767823039`	rtf-objdata-decoded	RTF \objdata at offset 0x32BA4	2632 bytes
`objdata_02_off00034147.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x34147	12297 bytes

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