RTF / .DOC malware analysis — malicious · f97412f5ddac8351

MALICIOUS

RTF / .DOC

218.9 KB First seen: 2022-04-08

MD5: c74d2a18dba1bf2d337e503f998d92e2 SHA-1: 571ab67ae3e258197a459bee4b7a37a9657a4515 SHA-256: f97412f5ddac8351f3d6efdb6982cb05aafa4f96bbdd7f85add14a7b4f850f01

140 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The RTF document contains multiple OLE objects, including embedded objects and OLE object data. The presence of `RTF_OBJUPDATE` and `RTF_COMPOSITE_MONIKER_RELATED` heuristics indicates that these objects are likely designed to be activated automatically or upon user interaction. The document body explicitly instructs the user to "Enable Editing", a common social engineering tactic to bypass macro security and allow the execution of embedded malicious content. No scripts were extracted, and no specific IOCs were identified beyond the document structure itself.

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
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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000ba2.bin` `f13273e9d9f96c05282f1dcaf36f521dcad6484a5033b372a3e3ede80b0dd08a`	rtf-objdata-decoded	RTF \objdata at offset 0xBA2	15941 bytes
`objdata_01_off00008dc4.bin` `1721aab459b68b884f13b5caf8aed48f2f1a5eb3d65c1b2ddac08c7c93062de4`	rtf-objdata-decoded	RTF \objdata at offset 0x8DC4	2632 bytes
`objdata_02_off0000a367.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0xA367	12297 bytes

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