8d64b90b5331eadd4ef5adfb7bea163d7f8249a13f0853775a9dc7d9e74eafc8

Analysis

max time kernel
139s
max time network
128s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
26-08-2024 05:49

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General

Target

RunDict.exe
Size

389KB
MD5

46cf3f4e4154eba3a691de0850492c3d
SHA1

2f8ae36888f013d56765d5e09036b3734861f214
SHA256

801466b09c6cab683ee644b803e4078db52c5cd52f98f0e05a3fa736e83e800f
SHA512

ea30eda94f7c221742f3a4850e0abaf4ff127e4474f7acf31b4392e5025c6ca220d59a51841c403e4d73bf45b255000f9b20672aaee820761a7fcdc87c5ddbf8
SSDEEP

6144:SfaLwjN+iXdbYMYSTnz8wNW1NGv/HhQ1UCDICJlhXr7:Sx+it8m7NW3MHhQ1J5h77

Score

7^/10

discovery

Malware Config

Signatures

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\Control Panel\International\Geo\Nation	RunDict.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\plug_ins\YodaoDict.api	YodaoDict.exe
File opened for modification	C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\plug_ins\YodaoDict.api	YodaoDict.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RunDict.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	YodaoDict.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wordbook.exe

Modifies Internet Explorer settings 1 TTPs 4 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch	YodaoDict.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\SOFTWARE\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running"	YodaoDict.exe
Key created	\REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\Software\Microsoft\Internet Explorer\IESettingSync	YodaoDict.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\SOFTWARE\Microsoft\Internet Explorer\IESettingSync\SlowSettingTypesChanged = "2"	YodaoDict.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: 33	3904	YodaoDict.exe
Token: SeIncBasePriorityPrivilege	3904	YodaoDict.exe
Token: 33	3904	YodaoDict.exe
Token: SeIncBasePriorityPrivilege	3904	YodaoDict.exe

Suspicious use of FindShellTrayWindow 6 IoCs

pid	Process
3904	YodaoDict.exe
3904	YodaoDict.exe
3904	YodaoDict.exe
3904	YodaoDict.exe
3904	YodaoDict.exe
3904	YodaoDict.exe

Suspicious use of SendNotifyMessage 4 IoCs

pid	Process
3904	YodaoDict.exe
3904	YodaoDict.exe
3904	YodaoDict.exe
3904	YodaoDict.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
3904	YodaoDict.exe
3904	YodaoDict.exe
3904	YodaoDict.exe
3904	YodaoDict.exe
3904	YodaoDict.exe
3904	YodaoDict.exe
3904	YodaoDict.exe
3904	YodaoDict.exe
1616	wordbook.exe
1616	wordbook.exe
1616	wordbook.exe
1616	wordbook.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1912 wrote to memory of 3904	1912	RunDict.exe	88
PID 1912 wrote to memory of 3904	1912	RunDict.exe	88
PID 1912 wrote to memory of 3904	1912	RunDict.exe	88
PID 3904 wrote to memory of 2896	3904	YodaoDict.exe	89
PID 3904 wrote to memory of 2896	3904	YodaoDict.exe	89
PID 3904 wrote to memory of 1616	3904	YodaoDict.exe	91
PID 3904 wrote to memory of 1616	3904	YodaoDict.exe	91
PID 3904 wrote to memory of 1616	3904	YodaoDict.exe	91

C:\Users\Admin\AppData\Local\Temp\RunDict.exe
"C:\Users\Admin\AppData\Local\Temp\RunDict.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1912
- C:\Users\Admin\AppData\Local\Temp\YodaoDict.exe
  "C:\Users\Admin\AppData\Local\Temp\YodaoDict.exe" start
  2⤵
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Modifies Internet Explorer settings
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3904
- - C:\Windows\system32\pcaui.exe
    "C:\Windows\system32\pcaui.exe" -g {11111111-1111-1111-1111-111111111111} -x {5a82a30e-5da6-492d-8bb8-58d77df8d829} -a "YoudaoDictionary" -v "NetEase" -s "This app can't run because it causes security or performance issues on Windows. A new version may be available. Check with your software provider for an updated version that runs on this version of Windows." -n 1 -f 0 -k 0 -e "C:\Users\Admin\AppData\Local\Temp\YodaoDict.exe"
    3⤵
    PID:2896
- - C:\Users\Admin\AppData\Local\Temp\wordbook.exe
    hide deskdict:458800
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    PID:1616

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\Youdao\DeskDict\ddupdate\dictupdate.xml

Filesize
5KB

MD5
1aaac195b685939e22902871f0337d26

SHA1
07ac75f91dce9f6743644d5f6036170216b9f26e

SHA256
a5adf51560694560eebe7348b86505f0685adabbf9bb4ebd92bb03280f993e2e

SHA512
31bdcd4b3664a3f177e700333881801e6050a53bce4d97dfd0391bae814e0cbd7869a85b004062bd6c3605c4c00aa676cd54bba705e7620c4cb705ce34e78f29

Download Submit
C:\Users\Admin\AppData\Local\Temp\guid.dat

Filesize
17B

MD5
d3f06e1acd6e1db936ef9042e0b2a190

SHA1
95e7deff5a2a0f15cf920a9b106d416c8ef9b5e3

SHA256
d7b68b54d81848a2a3b2ae6efa51bc1d60a9471736c336617a6c90d57b35e3b6

SHA512
b0be0d21113c9cfb86471e2c20b0c788af848ef05d45bb198a0208a747db9e5899b56a93004f17f62e022d68bfcba44686d3e68aaddd09b5164658ca7d8a7a7e

Download Submit
memory/3904-0-0x0000000000B50000-0x0000000000B73000-memory.dmp

Filesize
140KB

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