RTF / .DOC malware analysis — malicious · 3a7e9e3acce7084d

MALICIOUS

RTF / .DOC

1.52 MB First seen: 2023-08-16

MD5: 79c4c36735d3c657aebb38413b4d1983 SHA-1: 06c8bd4fc23c4d932cb9efe3ee3cf28d906e8490 SHA-256: 3a7e9e3acce7084d991834a07d48907876ac05bfff985d1aa856f218d33c3f75

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains a critical heuristic firing for CVE-2017-11882, indicating the exploitation of a known vulnerability in Microsoft Equation Editor. The presence of OLE object data and excessive hex data further suggests that a payload is hidden within the document. The file is designed to trick users into opening it, leading to the execution of malicious code.

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 ~1593KB 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_off0000008f.bin` `01bdce911c1c4bba0b275b13c029c12d1e854dfbe17ac0786d2977776d26b092`	rtf-objdata-decoded	RTF \objdata at offset 0x8F	796704 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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