RTF malware analysis — malicious · fa8decfdba436d02

MALICIOUS

RTF

78.1 KB First seen: 2019-09-30

MD5: 1574c0acb2a99cd86777caacbfa18693 SHA-1: da216100e88eafc1dbe9d2d021b4924665694c45 SHA-256: fa8decfdba436d02863c30c4fb1ea7fcf13dac64346bf15a9fa9a1b766f38d0a

122 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating exploitation of a known vulnerability in the Equation Editor component. The \objupdate directive forces OLE activation, leading to arbitrary code execution. The extracted artifact suggests further malicious activity, likely payload delivery.

Heuristics 4

Split hex Equation Editor ProgID + OLE object critical CVE likely RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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 1 \objdata section(s) — embedded OLE objects
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000afa7.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xAFA7	9182 bytes
SHA-256: `2ca660391d94e9a43df3ce24d8bde968c5a5b3b42088b8cb0fed4ad81342a6c7`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.41, consistent with packed or encrypted content.

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