RTF / .DOC malware analysis — malicious · 52fa2e8c2e126d16

MALICIOUS

RTF / .DOC

1.64 MB

MD5: 0ff5919b6552c497ef64d831574a1c62 SHA-1: d892fb651e8d336e48ad0a0f7d88c6dd35359699 SHA-256: 52fa2e8c2e126d16feab59c47cdb6764e30a532000db97388ded751b0471e688

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file is an RTF document containing an embedded OLE object, which is a known technique for exploiting vulnerabilities. Specifically, the RTF_EQUATION_EDITOR heuristic indicates a likely exploit targeting the Equation Editor component. The presence of large, hex-encoded data within the OLE object suggests it's used to hide a payload. The extracted artifact 'objdata_00_off00000577.bin' is likely this payload, intended to be downloaded and executed.

Heuristics 5

Split hex Equation Editor ProgID + OLE object critical 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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1722KB of hex-encoded data inside \objdata sections — may hide a payload
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_off00000577.bin` `6302f7ca80f95b3ab81a39b0a1370c4ebef32b16baaebcc6220ac7960fdbfdc6`	rtf-objdata-decoded	RTF \objdata at offset 0x577	861128 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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