RTF / .DOC malware analysis — malicious · 01d7b1149b565f67

MALICIOUS

RTF / .DOC

1.65 MB

MD5: 48f7322b965984bdfc356f0843a78e61 SHA-1: 583c26da6d24575c1ff7b76d64a8a82a54181d90 SHA-256: 01d7b1149b565f6728fb3f3caeb30f988a6687cef75dd99f9d3850a9ec91af6f

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object specifically related to CVE-2017-11882, indicating exploitation for client execution. The presence of a large, high-entropy extracted artifact suggests it's a hidden payload. The document body is heavily obfuscated and does not provide clear user-facing content, but the heuristics strongly point to a malicious exploit document.

Heuristics 6

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
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_off0000104f.bin` `12f915ca4b52415e9ba3f45f53bc10229acdf022fa9055957134973526b4e10f`	rtf-objdata-decoded	RTF \objdata at offset 0x104F	861269 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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