RTF malware analysis — malicious · e2927074c551bb18

MALICIOUS

RTF

1.78 MB First seen: 2021-06-30

MD5: b697bcbb31268d4b2a9121ffa394d1b8 SHA-1: de04c4dcdeb05b23d20aa9cb80f4ceef72323a8d SHA-256: e2927074c551bb188b4c33bed9addc70c25dd3bb9a0f702874a6ae44039a3532

220 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains multiple indicators of malicious activity, including embedded OLE objects and specifically the RTF_EQUATION_EDITOR heuristic firing, which points to the exploitation of CVE-2017-11882. This vulnerability allows for the execution of arbitrary code, likely to download and run a secondary payload. The presence of shellcode command strings in the extracted artifact further supports this conclusion.

Heuristics 6

Split hex Equation Editor ProgID + OLE object critical CVE likely 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.
Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED

RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
\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.
Suspicious extracted artifact high 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.
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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000011e1.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x11E1	53954 bytes
SHA-256: `5ae74f0d63363706b9af41fa1da44944f0d686e2c87b06322ab0df849d26eb5b`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): Wscript.ScriptFullName
`objdata_01_off0002fdb7.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2FDB7	454791 bytes
SHA-256: `abd132bf3ab8190dfb030bcb879a36061e9aef78c1060b63bd0588b35c7d316c`

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