RTF / .DOC malware analysis — malicious · c93428a2e1bd77c6

MALICIOUS

RTF / .DOC

218.3 KB First seen: 2022-04-11

MD5: eaa0648afbacb9be504cf984b0edc07a SHA-1: 873e60467c2dc344254611db5842450a7d8e67c1 SHA-256: c93428a2e1bd77c6f4a5e9ed387297311d6ba1e31f9b5234cbec1e63ab2957b3

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains multiple OLE objects, with one specifically triggering activation via \objupdate. This, combined with the "Macro/content-enable lure" heuristic, indicates a likely attempt to trick the user into enabling editing to execute embedded malicious content. No scripts were extracted, but the OLE object data itself is suspicious and warrants further investigation as a potential dropper.

Heuristics 6

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
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
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_off00000ba4.bin` `b8ae64a05494e30d3b72c570ffc600aea14b3de576df7238e3e37e22c9d5cbfb`	rtf-objdata-decoded	RTF \objdata at offset 0xBA4	15635 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00008b4a.bin` `64b1f15a0e9494bf93ea2a1e9ea1b7d807d3f377db217eed0f95ae662942e168`	rtf-objdata-decoded	RTF \objdata at offset 0x8B4A	2632 bytes
`objdata_02_off0000a0ed.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0xA0ED	12297 bytes

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