RTF / .DOC malware analysis — malicious · 5610e552b9a56a2b

MALICIOUS

RTF / .DOC

328.4 KB

MD5: 356de21f3911e2878ee196dcd3751036 SHA-1: 23095d8bf5ecfc5974e079c642d571ba118d9ece SHA-256: 5610e552b9a56a2b9be262db3c518975066bce0a0f2190b4b9df898a762a3329

180 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 User Execution: Malicious File T1059 Command and Scripting Interpreter T1203

The presence of \objupdate and \objautlink control words in an RTF document is a strong indicator of an Equation Editor exploit. The document also contains a lure to trick the user into enabling content,- a common delivery mechanism for initial access. No scripts were extracted from the sample, but the same structural patterns ares a high-confidence call for an exploit-based dropper.

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` `88f80aae919c66ecb86668cce13e3863a5aa6245ffb73048bcbd71ed47900f64`	rtf-objdata-decoded	RTF \objdata at offset 0xBAC	56437 bytes
`objdata_01_off0000735b.bin` `96c40213d24ea0b53b74473b11f6b1004f07e64c011a329eba4a5bf44f68d918`	rtf-objdata-decoded	RTF \objdata at offset 0x735B	56410 bytes
`objdata_02_off00023e50.bin` `a8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379`	rtf-objdata-decoded	RTF \objdata at offset 0x23E50	2632 bytes
`objdata_03_off000253f3.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x253F3	12297 bytes

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