RTF / .DOC malware analysis — malicious · e44ff3e7d575fbc2

MALICIOUS

RTF / .DOC

334.9 KB

MD5: c431d09b3af2211a74331c6d8fae7b6d SHA-1: 5713f7bfd9453ea2a1a85733213a256e6b15a765 SHA-256: e44ff3e7d575fbc24d4d206e20c1d1f7bca10350b1bcf21ac9465b7d37b9f885

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter T1071.001 Application Layer Compromise T1566.001 Privilege Escalation T1071.002 Remote Services Execution T1071.003 Application Services T1071.005 User Execution

The file's structure, particularly the use of extit{objdata}, extit{objemb}, extit{objautlink}, and extit{objupdate} control words within the RTF document, strongly indicates a malicious intent. These controls are commonly employed in Equation Editor exploits and other document-based dropper techniques. The document's instruction to enable macros or editing further supports this assessment, as it attempts to bypass Office macro security settings. The embedded OLE objects likely contain a malicious executable or script designed to perform actions such as downloading and executing a secondary payload. The presence of a Composite Moniker suggests an attempt to exploit CVE-2017-8570, though the evidence is not conclusive.

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 4 \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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000bac.bin` `14d8cc23b008b87506129bd60b25afcc34fcf574280888af2e16c6eddae9ec3c`	rtf-objdata-decoded	RTF \objdata at offset 0xBAC	59595 bytes
`objdata_01_off0000735b.bin` `62eeb82691abf6cf76092f3b07cb0e184db65c2bc4a2af86f76fa9f9dfd0ab8f`	rtf-objdata-decoded	RTF \objdata at offset 0x735B	59568 bytes
`objdata_02_off000257fa.bin` `a8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379`	rtf-objdata-decoded	RTF \objdata at offset 0x257FA	2632 bytes
`objdata_03_off00026d9d.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x26D9D	12297 bytes

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