RTF malware analysis — malicious · de28d4248537ba42

MALICIOUS

RTF

1.02 MB

MD5: 0a5e293f205fcd9d94853d3bb9a666b5 SHA-1: 19e07bfc25010af8f4b871c57c838a9414fec556 SHA-256: de28d4248537ba423b5f18576592743ef321047b243fa11b9c8bd3e375a1e125

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The RTF file contains multiple embedded OLE objects, with high-confidence heuristics indicating automatic linking and update triggers designed to activate the embedded content. The presence of excessive hex-encoded data within these objects suggests a hidden payload. A 'Macro/content-enable lure' heuristic further indicates the document attempts to trick the user into enabling execution, a common technique for malware droppers.

Heuristics 7

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1037KB of hex-encoded data inside \objdata sections — may hide a payload
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_off00000966.bin` `904056f2011f00608f1ca7ed58408cdca7b658c471e3602f2685b16217cb328f`	rtf-objdata-decoded	RTF \objdata at offset 0x966	408296 bytes
`objdata_01_off00007115.bin` `ec3ace85098307c664f224a9f92e41dc08c1a0e33319c7ceb5729fa26fbcc4b0`	rtf-objdata-decoded	RTF \objdata at offset 0x7115	408269 bytes
`objdata_02_off000d66e6.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0xD66E6	2632 bytes
`objdata_03_off000d7c89.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0xD7C89	12297 bytes

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