RTF / .DOC malware analysis — malicious · bb55b3a58a77cab9

MALICIOUS

RTF / .DOC

3.91 MB

MD5: c2989432ef6aefcc5205a9a77d14de18 SHA-1: 8ae0b63e3ea0e87f3bd79342705b8dd7cee99d4a SHA-256: bb55b3a58a77cab9bd1e66a481119c7c17655cc922cb64510d059a2a9faeeaa8

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an OLE object that is indicative of the CVE-2017-11882 Equation Editor vulnerability. This exploit is known to embed and execute a secondary payload. The presence of large, high-entropy hex-encoded data within the OLE object further supports the likelihood of a hidden payload being delivered.

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 ~4096KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 2 \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_off0000006c.bin` `dc86912cb50be45ee1176652e1f1dbd703185a938894465a03172045bdef78bb`	rtf-objdata-decoded	RTF \objdata at offset 0x6C	2048296 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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