bc0a1fcda7c1e2f33ac4ba5b4bf842c2c998d672c6cdd1855ffee526ae20f3f8

General

Target

idk.exe
Size

839KB
MD5

54e1acf7a7769c332fde3c497fc722ad
SHA1

b57224bc44bac62740b78fe86afa3a7fb83b901e
SHA256

bc0a1fcda7c1e2f33ac4ba5b4bf842c2c998d672c6cdd1855ffee526ae20f3f8
SHA512

74e4c93dfe8fa742726b321fd2de1be70bc7e710f6e9010ec2ca823ff2941ca00c51e52e5e2eabac6f8e19b0710bf8831746eb5d91eda15218bbe52dbcfe969f
SSDEEP

24576:6BS04YNEMuExDiU6E5R9s8xY/2l/dGtnIbt+ro:6j4auS+UjfU2TGdIbt+r

Score

7^/10

discovery

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
3464	AudioDriver.exe

Drops desktop.ini file(s) 2 IoCs

description	ioc	Process
File created	C:\Windows\assembly\Desktop.ini	idk.exe
File opened for modification	C:\Windows\assembly\Desktop.ini	idk.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\assembly\Desktop.ini	idk.exe
File opened for modification	C:\Windows\assembly\Desktop.ini	idk.exe
File opened for modification	C:\Windows\assembly	idk.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 2 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	idk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AudioDriver.exe

Modifies registry class 4 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoftwindows.client.cbs_cw5n1h2txyewy\Internet Settings\Cache\Cookies\CachePrefix = "Cookie:"	BackgroundTransferHost.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoftwindows.client.cbs_cw5n1h2txyewy\Internet Settings\Cache\History\CachePrefix = "Visited:"	BackgroundTransferHost.exe
Key created	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000_Classes\Local Settings\MuiCache	BackgroundTransferHost.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoftwindows.client.cbs_cw5n1h2txyewy\Internet Settings\Cache\Content\CachePrefix	BackgroundTransferHost.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

pid	Process
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe
3464	AudioDriver.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3464	AudioDriver.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3464	AudioDriver.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3464	AudioDriver.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4220 wrote to memory of 3464	4220	idk.exe	77
PID 4220 wrote to memory of 3464	4220	idk.exe	77
PID 4220 wrote to memory of 3464	4220	idk.exe	77

C:\Users\Admin\AppData\Local\Temp\idk.exe
"C:\Users\Admin\AppData\Local\Temp\idk.exe"
1⤵
- Drops desktop.ini file(s)
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4220
- C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  PID:3464

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalService -p -s NPSMSvc
1⤵
PID:3120

C:\Windows\system32\BackgroundTransferHost.exe
"BackgroundTransferHost.exe" -ServerName:BackgroundTransferHost.13
1⤵
- Modifies registry class
PID:4628

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\AC\BackgroundTransferApi\bfac2432-8ad8-43f7-90c9-808894d33a18.down_data

Filesize
555KB

MD5
5683c0028832cae4ef93ca39c8ac5029

SHA1
248755e4e1db552e0b6f8651b04ca6d1b31a86fb

SHA256
855abd360d8a8d6974eba92b70cbd09ce519bc8773439993f9ab37cb6847309e

SHA512
aba434bd29be191c823b02ea9b639beb10647bbe7759bbffdaa790dfb1ec2c58d74c525ef11aacda209e4effe322d1d3a07b115446c8914b07a3bce4d8a0e2c3

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe

Filesize
839KB

MD5
54e1acf7a7769c332fde3c497fc722ad

SHA1
b57224bc44bac62740b78fe86afa3a7fb83b901e

SHA256
bc0a1fcda7c1e2f33ac4ba5b4bf842c2c998d672c6cdd1855ffee526ae20f3f8

SHA512
74e4c93dfe8fa742726b321fd2de1be70bc7e710f6e9010ec2ca823ff2941ca00c51e52e5e2eabac6f8e19b0710bf8831746eb5d91eda15218bbe52dbcfe969f

Download Submit
memory/3464-19-0x0000000074990000-0x0000000074F41000-memory.dmp

Filesize
5.7MB

Download
memory/3464-20-0x0000000074990000-0x0000000074F41000-memory.dmp

Filesize
5.7MB

Download
memory/3464-21-0x0000000074990000-0x0000000074F41000-memory.dmp

Filesize
5.7MB

Download
memory/3464-22-0x0000000074990000-0x0000000074F41000-memory.dmp

Filesize
5.7MB

Download
memory/4220-0-0x0000000074991000-0x0000000074992000-memory.dmp

Filesize
4KB

Download
memory/4220-1-0x0000000074990000-0x0000000074F41000-memory.dmp

Filesize
5.7MB

Download
memory/4220-2-0x0000000074990000-0x0000000074F41000-memory.dmp

Filesize
5.7MB

Download
memory/4220-18-0x0000000074990000-0x0000000074F41000-memory.dmp

Filesize
5.7MB

Download

Analysis

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