RTF / .DOC malware analysis — malicious · 29a01a4410471e67

MALICIOUS

RTF / .DOC

1.06 MB

MD5: fd436b2007cfdbef69366c5c4ceef9ef SHA-1: 166ac95713d2df544c4770fbb816f905cd965f65 SHA-256: 29a01a4410471e679e150944195bd592314beaa00b1e99de5f115ee7e9df44de

242 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The RTF document contains an embedded OLE object with a ProgID indicative of Equation Editor, triggering critical heuristics for RTF_EQUATION_EDITOR and CVE_2017_11882_RELATED. The presence of ".bin" file with high entropy and the ".objupdate" heuristic further suggest that this object is designed to execute a second-stage payload. The exploitation of CVE-2017-11882 is a common technique for initial execution.

Heuristics 7

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 ~1103KB 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
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_off000019e9.bin` `bb6e84c88d2d3cb8730366662d3ee3ceb94eeafaf9281fba302fe5fcc0406949`	rtf-objdata-decoded	RTF \objdata at offset 0x19E9	551835 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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