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

Static analysis result for SHA-256 3a276de4f47aa771…

MALICIOUS

Office (OOXML) / .XLSM

48.2 KB Created: 2020-02-01 18:28:07 UTC Authoring application: Microsoft Excel 12.0000
MD5: 3be3a0513b96fc1389aae03ab13c38fd SHA-1: de84d88411ff1c121fadc1ae2a9ddb172d2c773c SHA-256: 3a276de4f47aa77187c43dcd49829b43dd48934e22e6f558435ca4f3e1abc45c
320 Risk Score

Malware Insights

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

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1059.003 Command and Scripting Interpreter: Windows Command Shell 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. The critical heuristic CVE_2017_11882_EQUATION_NATIVE_CMD indicates the exploitation of CVE-2017-11882 via an embedded Equation Editor object. This exploit attempts to execute a command-line stager, reconstructing the command as 'cmd /c ren %tmp%\mm v&wSCRIPT %tmp%\v..wsf ..C.......................................................'. This suggests the file is a dropper designed to download and execute 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: 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
9e020bd833db1caba6f52123e633c357c17c5f99ee03c5f6aace3da45317748f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 30750 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
6b1100def7526a165cc21eb8e95318130edc96efe227f24df446fd5209febe99		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
671f110b4d4c052a1c66d7eaaf70ce417a68f452dc7b386918ad6f8fde019771		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1316 bytes
ooxml_oleobject_01.bin
122908edb698f6463b9cb8149e31d3d7b5554b0763a82e820b336f1109cacd20		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject3.bin 5936 bytes
ooxml_oleobject_02.bin
f186708d15e9d61d4792e6ccace7e3f4238f7badf398c41dc29ca494f8c2f478		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 12800 bytes
ooxml_oleobject_02_ole10native_00.bin
7b83138d085a3ef3780076c60af3ef934b5831d57dac950438764170e1dfd568		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 10006 bytes
ooxml_oleobject_03.bin
e2ffbef67b453a44ae2387416ffb6aab2605d2a876c1506da66b668a5dc9fea8		 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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