RTF / .DOC malware analysis — malicious · 69a11d4f80384ffe

MALICIOUS

RTF / .DOC

127.8 KB

MD5: f0c28badb5e2c4511b2b25526431a202 SHA-1: 3c6336140819d5d25782c4e0342be6fa9064b044 SHA-256: 69a11d4f80384ffe3c64d1a153e647006ca99b133b6ff6199dddb6d18ccceffc

202 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object related to Equation Editor, specifically triggering the CVE-2017-11882 vulnerability. This vulnerability is known to be used to execute arbitrary code, typically to download and run a second-stage payload. The presence of the objdata artifact further supports the exploitation of embedded objects.

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 1 \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_off00001e09.bin` `706bec12340ac2bd93f909184a8c4dd6ea023002b051cba80d822021d2c843aa`	rtf-objdata-decoded	RTF \objdata at offset 0x1E09	61545 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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