RTF malware analysis — malicious · eb8381b156aad734

MALICIOUS

RTF

100.1 KB First seen: 2024-08-31

MD5: 1131d758c8208af277e943f04339e646 SHA-1: 030adac1abc31aa8bc3a22dda63c4a005aee6e88 SHA-256: eb8381b156aad734ef3a0328b4985ed1edeca1c8d79d66e094598f8c6992ac71

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-11882) to execute arbitrary code. The presence of OLE object data and the ".objupdate" directive strongly indicate an attempt to exploit this vulnerability. This technique is commonly used to download and execute a second-stage payload, leading to further system compromise.

Heuristics 4

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001487.bin` `a8c816a2f91f8b175b098e93e5416ca207694015fef355d864985912abbdb6c7`	rtf-objdata-decoded	RTF \objdata at offset 0x1487	2101 bytes

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