RTF / .DOC malware analysis — malicious · adc39a0ad2706609

MALICIOUS

RTF / .DOC

536.4 KB First seen: 2021-09-29

MD5: 21926e4c6197b0e04ed60d3f7878f094 SHA-1: d2dd748a9992e80647a54c0dfef4f6a848ef3d0b SHA-256: adc39a0ad27066098b272d68378e904e31a11e8d847ded6a9796dde0d6773a59

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple embedded OLE objects, with heuristics indicating automatic linking and update triggers. This suggests the document is designed to exploit OLE object activation to execute arbitrary code upon opening. The 'SE_ENABLE_LURE' heuristic further supports this, indicating the document likely contains instructions to bypass macro security. No specific malware family is identifiable from the provided evidence.

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off00000bb0.bin` `e906c1cdcfe01ee725b9a9ceb5a5293e3bc99cb1cd599cd8228959df1fb502bd`	rtf-objdata-decoded	RTF \objdata at offset 0xBB0	171558 bytes
`objdata_01_off00057e39.bin` `9d9bc825f2fa5e0ed8db7dce6823e199ad9c775873472d42887214589f205470`	rtf-objdata-decoded	RTF \objdata at offset 0x57E39	2632 bytes
`objdata_02_off000593dc.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x593DC	12297 bytes

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