Xls.Dropper.Sdrop-9451844-0 — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 dac9c16cd10e297e…

MALICIOUS

Office (OOXML) / .XLSM

48.6 KB Created: 2020-02-01 18:28:07 UTC Authoring application: Microsoft Excel 12.0000
MD5: dd361a07fb2726a91c61f76229b03c35 SHA-1: 395d50e0985ec291d1e1407f4c9c1ad37e46ba49 SHA-256: dac9c16cd10e297efb82d1329a61806b4d04c08c297592f153d357f64a3f74fd
320 Risk Score

Malware Insights

Xls.Dropper.Sdrop-9451844-0 · confidence 95%

This XLSM file contains an Auto_Open VBA macro that leverages the CVE-2017-11882 vulnerability within an embedded Equation Editor OLE object. The macro executes a command-line stager, specifically 'cmd /c ren %tmp%\mm v&WScRIPT %tmp%\v?..wsf ..C.......................................................', which likely downloads and executes a second-stage payload. The presence of obfuscated VBA code and the specific exploit indicate a dropper functionality.

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: Xls.Dropper.Sdrop-9451844-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Sdrop-9451844-0
  • 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
d6b02f2fdaa30dc4aee8224a646585a8b082f20adfaaf22d6f07d8c393c36226		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 29236 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). 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
671c85466cdb8a263da36abdd94134735f4b2a2eff366a56f630d015322c0f7c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject3.bin 5936 bytes
ooxml_oleobject_01.bin
8cfd1cd9020e0ec902d474a172f81627950a2010181132f0b361a538fa61a4c4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 12800 bytes
ooxml_oleobject_01_ole10native_00.bin
5fd46f44b6eea62ef03e612e29904bbc7cbc802eb06e9c1c347c9b5b0c9173c3		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 10205 bytes
ooxml_oleobject_02.bin
df1b8f667f31a5b25f91257d3dae1cd6691dbcb8bf54e6e915384e1a79f24ec6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_02_ole10native_00.bin
56fc5dcef6ff07d4be955fd8a78580ec0f16d8e50dbe9d700b72ba9f09b62e60		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1281 bytes
ooxml_oleobject_03.bin
ce15064eaf17ff07495c9900dbfd225a698488a62f299b87b10ace4bededf3bb		 ooxml-ole-object OOXML embedded OLE part: xl/vbaProject.bin 52736 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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