RTF / .DOC malware analysis — malicious · ab872f0274a1a7df

MALICIOUS

RTF / .DOC

536.4 KB First seen: 2021-10-02

MD5: d56253b57ca9f34a43d7507ecc56111a SHA-1: 12841702f0dd7b0731f74fab5d4b9c94af092b4d SHA-256: ab872f0274a1a7df8703d909e227f5d447a2252842d3471c0c69c6835c3af828

180 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The RTF document contains multiple OLE objects, including automatically linked and updated objects, which are designed to activate embedded content. The presence of a 'Macro/content-enable lure' heuristic indicates the document explicitly instructs the user to enable macros or editing. This combination strongly suggests the document is a lure to bypass security measures and execute a malicious payload, likely a downloader.

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` `831ca01152cb19df3936319744be61a5203a57fcbeabd7589a988405543a551b`	rtf-objdata-decoded	RTF \objdata at offset 0xBB0	171566 bytes
`objdata_01_off00057e49.bin` `9d9bc825f2fa5e0ed8db7dce6823e199ad9c775873472d42887214589f205470`	rtf-objdata-decoded	RTF \objdata at offset 0x57E49	2632 bytes
`objdata_02_off000593ec.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x593EC	12297 bytes

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