RTF malware analysis — malicious · 3db84de7c515ee98

MALICIOUS

RTF

217.4 KB First seen: 2022-04-12

MD5: ac1856dce2a0217dfe0e9ba506c7ca44 SHA-1: d2f6647abb3cf4752716c1363c638e1d242310b4 SHA-256: 3db84de7c515ee983952cf7f61787260005eac2ab5e2b079b00419680cdf95a8

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple embedded OLE objects, indicated by RTF_OBJDATA and RTF_OBJEMB heuristics. The RTF_OBJUPDATE and RTF_COMPOSITE_MONIKER_RELATED firings suggest that these objects are designed to be activated, likely to execute malicious code. The presence of suspicious extracted artifacts further supports this. No scripts were extracted, and the document body contained only formatting information, so the attack pattern is inferred from the OLE object exploitation.

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` `a595dce45d8e3ac4b0dcbd050343f24d74408531a5bd39f25f4de1f4ce532751`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	15635 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00008778.bin` `64b1f15a0e9494bf93ea2a1e9ea1b7d807d3f377db217eed0f95ae662942e168`	rtf-objdata-decoded	RTF \objdata at offset 0x8778	2632 bytes
`objdata_02_off00009d1b.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9D1B	12297 bytes

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