RTF / .DOC malware analysis — malicious · d5e1c2f94dbe9a7a

MALICIOUS

RTF / .DOC

536.4 KB First seen: 2021-10-02

MD5: 55443c17ae610377db8914206f644d9a SHA-1: 54f502fc8d45420b39e30d92730a369c0621ee2d SHA-256: d5e1c2f94dbe9a7a5f53dbe3d39e572f8655682702520cf96230999b353544e0

180 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 high-confidence firings indicating automatic linking and update triggers designed to activate embedded content. The 'SE_ENABLE_LURE' heuristic confirms the document instructs the user to enable macros or editing, a common technique for malware droppers. While no specific scripts were extracted, the OLE object activation strongly suggests the document is designed to download and execute a second-stage payload.

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` `f32c306c175bf3be915caa3a7c0e941c9130a7767a98180f97b9d9e33298e4fc`	rtf-objdata-decoded	RTF \objdata at offset 0xBB0	171562 bytes
`objdata_01_off00057e41.bin` `9d9bc825f2fa5e0ed8db7dce6823e199ad9c775873472d42887214589f205470`	rtf-objdata-decoded	RTF \objdata at offset 0x57E41	2632 bytes
`objdata_02_off000593e4.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x593E4	12297 bytes

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