Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 3cc7000f6f2bf315…

MALICIOUS

Office (OOXML) / .XLSM

51.3 KB Created: 2020-02-01 18:28:07 UTC Authoring application: Microsoft Excel 12.0000
MD5: 8e1f4ab0814d4990e6ab52339d8b79b3 SHA-1: f7237b7632c1aa3e6505f5f12efe5f05827331db SHA-256: 3cc7000f6f2bf315a4fc3fb0ef9035f8683d4660648e23cb178656eae79b2dc5
320 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File Execution T1204.002 Malicious File Execution: Malicious File T1059 Command and Scripting Interpreter T1059.003 Command and Scripting Interpreter: Windows Command Shell T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The sample is an XLSM file containing VBA macros, including an Auto_Open macro, which is a common delivery mechanism. It exploits CVE-2017-11882 through an embedded Equation Editor OLE object. The embedded object contains a command stager that attempts to execute a script from the %tmp% directory, likely to download and run a second-stage payload.

Heuristics 8

  • CVE-2017-11882 — Equation Editor command stager critical CVE likely CVE_2017_11882_EQUATION_NATIVE_CMD
    Embedded Equation Editor OLE data contains an invalid Equation Native/MTEF stream with an embedded command stager. This is likely CVE-2017-11882 exploitation because the vulnerable Equation Editor component is reached and the malformed native stream directly carries process-launch bytes.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject3.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • ClamAV: Doc.Dropper.Detected-9977031-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Detected-9977031-0
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4483f4fce9aa2ac84001e2c780903463d322e86fd959467d230d66c24498b5d0		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 20966 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
ooxml_oleobject_00.bin
509828e962babb9f383dd8ac2e56c55a4a1747019a6406152e4e66bdad4f0225		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject3.bin 5936 bytes
ooxml_oleobject_01.bin
b62d255062fa4be7c7fc3ae373a6ee0d7ab339403ec920e80c46db2f16785fa5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 13312 bytes
ooxml_oleobject_01_ole10native_00.bin
a6e499c7b051c22ba22caf13e0a7b4c39926ca6b34a27a91ade25e4cc4dd2338		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 10290 bytes
ooxml_oleobject_02.bin
72d31e9fd2e504911394197b1a5751f1a4780621f2eaeada979252588554b4c3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 15872 bytes
ooxml_oleobject_02_ole10native_00.bin
f9adfdf46080f8b770337e50a0d4a574432d2c8594fd1abfbbf34cb784f35207		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 12817 bytes
ooxml_oleobject_03.bin
30e03f2486ac0d7b845f4e1163fc7c947d548f7e4598fd709202bcda662dc443		 ooxml-ole-object OOXML embedded OLE part: xl/vbaProject.bin 50176 bytes
emf_00.emf
979dde2aed02f077c16ae53546c6df9eed40e8386d6db6fc36aee9f966d2cb82		 ooxml-emf OOXML EMF part: xl/media/image1.emf 4968 bytes
emf_01.emf
4d4d1e7b04c99dcb8e885915068ad6f74cc2333e91580cdae5ccaa00c427247f		 ooxml-emf OOXML EMF part: xl/media/image2.emf 1536 bytes

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