RTF malware analysis — malicious · f0f8a88604193051

MALICIOUS

RTF

687.8 KB Created: 2019-07-16 06:04:00 First seen: 2020-01-07

MD5: 9170eb9eba5241da290a83b75bff4968 SHA-1: 6b214908b5dd938c90cd08f0ef6fd625c33874c1 SHA-256: f0f8a8860419305185c4a113edcd763e5501d7cdc4df59dce40605108adb8bba

122 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple embedded OLE objects, with one specifically identified as a Package object. The presence of \objupdate directives strongly suggests that these objects are designed to be activated automatically upon opening the document, leading to the execution of embedded malicious code. This indicates an exploitation attempt targeting client execution, likely delivered via spearphishing.

Heuristics 5

\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.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
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
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000298e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x298E	288146 bytes
SHA-256: `d9da9be0265994e9e11fe9217e53dff535f46c4bdcff9933b55b75abfb0f4015`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off0008f513.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8F513	21563 bytes
SHA-256: `e03b84cd60be7e8854bc09d56ed49e71525434f1f4b7f0c81a01885868609eb8`
`objdata_02_off0009b282.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9B282	21563 bytes
SHA-256: `6f59162db72e8b6c5d953d6df8bcb7d8d8d3dd35b6a285fdb83126590489197e`

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