RTF / .DOC malware analysis — malicious · 3311c6c434d1f79e

MALICIOUS

RTF / .DOC

434.7 KB

MD5: e2b13aca0faad12e244f1b8f31d1f3f8 SHA-1: 66bf86ad16fc6e7be44135f38586f9e8b5599244 SHA-256: 3311c6c434d1f79eed07e089b7193b4ebd61067961eb9d10fc1232b67591ad88

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The RTF document contains an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). The heuristic firings indicate the presence of a malicious OLE object and the specific exploit related to Equation Editor. This exploit is known to download and execute a secondary payload, making it a critical threat.

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.
OLE object data medium RTF_OBJDATA

RTF contains 2 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off000017e6.bin` `50ecef7dd6d220497476297694cbae44e366672a6f44cc6564aabdf185789f02`	rtf-objdata-decoded	RTF \objdata at offset 0x17E6	219384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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