RTF / .DOC malware analysis — malicious · 975db2c952d7ae22

MALICIOUS

RTF / .DOC

283.5 KB First seen: 2022-02-21

MD5: 8a4456f0886d0815cc33de4bc8684ed3 SHA-1: 07aa9482a56a9a5c7f01340429201f5a2ef042d3 SHA-256: 975db2c952d7ae224ec3c44baf875d150b26ab885a3b9885395edcd95014d480

140 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment

The RTF document contains multiple OLE objects, with specific heuristics indicating the use of ".objupdate" and Composite Monikers, suggesting an attempt to activate embedded content. The document body explicitly instructs the user to 'Enable Editing', a known lure to bypass macro security and execute embedded malicious code. No scripts were extracted, and no URLs were found, limiting further analysis of the payload.

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` `35e1bae2b246b352b93b759bd767992a006516162b507e59484e697127518505`	rtf-objdata-decoded	RTF \objdata at offset 0xBA2	47725 bytes
`objdata_01_off00019004.bin` `893d8db8585190a273d0c7c3dcff2eb58184b866a3687a9319ca72a8284876cb`	rtf-objdata-decoded	RTF \objdata at offset 0x19004	2632 bytes
`objdata_02_off0001a5a7.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x1A5A7	12297 bytes

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