RTF / .DOC malware analysis — malicious · cedeb79d41b32f1d

MALICIOUS

RTF / .DOC

384.5 KB

MD5: 77c1685b3dc0d92bd82e4df4e14240b9 SHA-1: 0e0fbbf9e0e1554e0be28a1b48a095a2417910df SHA-256: cedeb79d41b32f1d6c4b9bb84da8c7ad0365627e85c5e259dff52436a66a8f01

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple OLE objects, with specific heuristics indicating the use of \objupdate and Composite Moniker, strongly suggesting an exploit targeting OLE object activation. One of the extracted embedded artifacts, objdata_00_off000007d1.bin, is flagged as suspicious due to script execution terms. This indicates the document is likely designed to drop and execute a secondary payload.

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` `87888dfb2a74a31c4307e84cc5b772efd5f8dfd1b88d5a706240951d37bd83fe`	rtf-objdata-decoded	RTF \objdata at offset 0x7D1	97907 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000323ec.bin` `c1062dbe2c516490ba03c091a3be0d514bef7428a936eb00367c1b3069f9cedc`	rtf-objdata-decoded	RTF \objdata at offset 0x323EC	2632 bytes
`objdata_02_off0003398f.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x3398F	12297 bytes

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