RTF malware analysis — malicious · 9c022ff2faf55f1f

MALICIOUS

RTF

217.6 KB First seen: 2022-04-18

MD5: 0bb771af458d3e5fa23c94b82c07da42 SHA-1: f808e6fd04e46bb11e3ce1686dbb9a8f2024ce33 SHA-256: 9c022ff2faf55f1f8f608c103038e29180925c3a1b33dcf35ead650737077cfb

154 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The RTF file contains multiple OLE objects, with heuristics indicating the use of \objdata and \objupdate, suggesting an attempt to exploit OLE activation for malicious purposes. The presence of composite monikers further supports this, pointing towards a technique that leverages OLE object embedding to execute arbitrary code. No scripts were extracted, and the document body contained only formatting information, making the OLE object exploitation the primary indicator of malicious activity.

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_off000007d2.bin` `b1a9f95a5d95f0e1506611f62ac003e9aaaff6ab29354f0a15d968f450221f07`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	15749 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00008866.bin` `7b74a822cc160a0a46dc6db6fcbc7a2291eea6fdb58fa98ed0d9b3907cb827e4`	rtf-objdata-decoded	RTF \objdata at offset 0x8866	2632 bytes
`objdata_02_off00009e09.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9E09	12297 bytes

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