RTF / .DOC malware analysis — malicious · d6ed4b9ed2939aa7

MALICIOUS

RTF / .DOC

261.6 KB First seen: 2022-03-21

MD5: 651fceed6acc2043785bcd4e018da2fb SHA-1: 843e3392fcb8cee678bdcc5dcef468f53c8379d6 SHA-256: d6ed4b9ed2939aa7c562e3834ab52215333570ebb80357a0b4fc76ac2985b162

140 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment T1137.003 DLL Search Order Hijacking

The RTF document contains multiple OLE objects, with heuristics indicating that \objupdate forces OLE activation and a Composite Moniker is present. The document body explicitly instructs the user to 'click Enable Editing to view the document,' a clear lure to bypass macro security settings. This suggests the document is designed to drop and execute a malicious payload via the embedded OLE object.

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` `e188cd53272ab93f14ce3fe8d4949816ca44429cca935aba6588558d64952daf`	rtf-objdata-decoded	RTF \objdata at offset 0xBA2	36940 bytes
`objdata_01_off00013862.bin` `563f80f6a3784d63d2ba6fa5af1c1360f9ba5ed48a8a15d334699378e3f436cf`	rtf-objdata-decoded	RTF \objdata at offset 0x13862	2632 bytes
`objdata_02_off00014e05.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x14E05	12297 bytes

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