RTF malware analysis — malicious · 921009fd88f969f8

MALICIOUS

RTF

6.4 KB First seen: 2019-04-17

MD5: c320a3a10ea3a0c26252a466e554a59d SHA-1: 8fcc5e73c8f6fe0f219a2912606f1976d799a278 SHA-256: 921009fd88f969f87f5a3539e03d443173d4983212a1ddf24698bc095052e79e

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object associated with Equation Editor, triggering critical heuristics for CVE-2017-11882. This exploit is known to facilitate arbitrary code execution, likely to download and run a secondary payload. The document body itself appears to be a template for supplier data, which is irrelevant to the exploit.

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.
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 medium 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_off00000cce.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xCCE	1619 bytes
SHA-256: `50edbe6b543af28d34e719de2b6fd695bdfbdc48c39ac4d28d571521374d011d`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

Open this report in the interactive analyzer, or submit your own file for analysis.