RTF malware analysis — malicious · 7e56f75e20270e24

MALICIOUS

RTF

1.79 MB First seen: 2021-07-13

MD5: f5d882f4a5a23e0c773db1d167347c11 SHA-1: e4f0bd3557b32fc5251a475c0d696f19efcc9f37 SHA-256: 7e56f75e20270e246612e230acc8db2d86ae9d8f8e0453b286bc0c108dd06c1b

220 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability related to Equation Editor. This exploit is designed to execute arbitrary code, likely a second-stage payload. The presence of shellcode command strings in the extracted artifacts further supports this attack vector.

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	61475 bytes
SHA-256: `99875c3b289260dec86cd8b7ce827450cc46a3618d4f7ec02f4b24826e64b910`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.ScriptName, WScript.Quit(), Cmd = strActivationID(""" ypoc c/ dmc") & sKeys & WScript.ScriptName & """ """ & lValue & """ /Y"
`objdata_01_off00034cc0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x34CC0	453383 bytes
SHA-256: `4d6664f118eedff717160ab4a66190ef5c19c482cce6369b56962aafb643a777`

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