metastealer | b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4

General

Target

b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
Size

927KB
MD5

d9f78b702ec7fd8a246103fe2eae5704
SHA1

90617fe3b2a7c71e6531eaa6b602c3ef86b3237d
SHA256

b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4
SHA512

1be56e8d51aa911acf2159ab9c04ae98b3bd7ee5e28a295d20f23b6918bf005d2e45314ae01dccce404e93f7146dd7b2d5b1b4119674560eab52e3a23f2f8aad

Score

10^/10

metastealer quasar office04 evasion spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

C2

127.0.0.1:4782

Mutex

936e6e55-d8a2-4cdc-a725-acb9291b9b7e

Attributes

encryption_key
627F681A7B8A3EA1E3B1DB478CE6E95260D73355
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

Meta Stealer Stealer
Meta Stealer steals passwords stored in browsers, written in C++.
stealer metastealer

Quasar Payload 1 IoCs

resource	yara_rule
behavioral2/memory/4468-140-0x0000000000400000-0x0000000000484000-memory.dmp	family_quasar

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Looks for VirtualBox Guest Additions in registry 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Executes dropped EXE 2 IoCs

pid	Process
2296	Client.exe
4968	Client.exe

Looks for VMWare Tools registry key 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Checks BIOS information in registry 2 TTPs 4 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	Client.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Client.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation	Client.exe

Maps connected drives based on registry 3 TTPs 4 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	Client.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	Client.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\SubDir\Client.exe	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
File opened for modification	C:\Windows\SysWOW64\SubDir\Client.exe	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
File created	C:\Windows\SysWOW64\SubDir\Client.exe	Client.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2608 set thread context of 4468	2608	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	83
PID 2296 set thread context of 4968	2296	Client.exe	89

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 2 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
3388	schtasks.exe
2036	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
4968	Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4468	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
Token: SeDebugPrivilege	4968	Client.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 2608 wrote to memory of 3388	2608	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	81
PID 2608 wrote to memory of 3388	2608	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	81
PID 2608 wrote to memory of 3388	2608	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	81
PID 2608 wrote to memory of 4468	2608	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	83
PID 2608 wrote to memory of 4468	2608	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	83
PID 2608 wrote to memory of 4468	2608	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	83
PID 2608 wrote to memory of 4468	2608	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	83
PID 2608 wrote to memory of 4468	2608	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	83
PID 2608 wrote to memory of 4468	2608	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	83
PID 2608 wrote to memory of 4468	2608	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	83
PID 2608 wrote to memory of 4468	2608	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	83
PID 4468 wrote to memory of 2296	4468	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	84
PID 4468 wrote to memory of 2296	4468	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	84
PID 4468 wrote to memory of 2296	4468	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	84
PID 2296 wrote to memory of 2036	2296	Client.exe	87
PID 2296 wrote to memory of 2036	2296	Client.exe	87
PID 2296 wrote to memory of 2036	2296	Client.exe	87
PID 2296 wrote to memory of 4968	2296	Client.exe	89
PID 2296 wrote to memory of 4968	2296	Client.exe	89
PID 2296 wrote to memory of 4968	2296	Client.exe	89
PID 2296 wrote to memory of 4968	2296	Client.exe	89
PID 2296 wrote to memory of 4968	2296	Client.exe	89
PID 2296 wrote to memory of 4968	2296	Client.exe	89
PID 2296 wrote to memory of 4968	2296	Client.exe	89
PID 2296 wrote to memory of 4968	2296	Client.exe	89

C:\Users\Admin\AppData\Local\Temp\b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
"C:\Users\Admin\AppData\Local\Temp\b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe"
1⤵
- Checks BIOS information in registry
- Checks computer location settings
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2608
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\aIXlnuuTVgzHfQ" /XML "C:\Users\Admin\AppData\Local\Temp\tmp184B.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:3388
- C:\Users\Admin\AppData\Local\Temp\b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
  "{path}"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4468
- - C:\Windows\SysWOW64\SubDir\Client.exe
    "C:\Windows\system32\SubDir\Client.exe"
    3⤵
    - Executes dropped EXE
    - Checks BIOS information in registry
    - Checks computer location settings
    - Maps connected drives based on registry
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:2296
  - - C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\aIXlnuuTVgzHfQ" /XML "C:\Users\Admin\AppData\Local\Temp\tmpC9F7.tmp"
      4⤵
      Creates scheduled task(s)
      PID:2036
  - - C:\Windows\SysWOW64\SubDir\Client.exe
      "{path}"
      4⤵
      Executes dropped EXE
      Drops file in System32 directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4968

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

4

T1082

Virtualization/Sandbox Evasion

2

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Client.exe.log

Filesize
1KB

MD5
ddde88120da5a6e61cf1c0d1fc3f5c99

SHA1
aef94de11f90c3e6a99478c03d24aa355a6d0e52

SHA256
353067996dbacb8d3ae38dcc754d06b92e34b8511ebe2fda8c2358bbf6b79924

SHA512
64994ad92b4751bf3d580ec683e9387d9f05fe44bcb80c343470e992ac793f94f4811ab7c4f2e7240d40d5fe49df8191b781ef994a7c30df1f80940c7b06e8bd

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe.log

Filesize
1KB

MD5
ddde88120da5a6e61cf1c0d1fc3f5c99

SHA1
aef94de11f90c3e6a99478c03d24aa355a6d0e52

SHA256
353067996dbacb8d3ae38dcc754d06b92e34b8511ebe2fda8c2358bbf6b79924

SHA512
64994ad92b4751bf3d580ec683e9387d9f05fe44bcb80c343470e992ac793f94f4811ab7c4f2e7240d40d5fe49df8191b781ef994a7c30df1f80940c7b06e8bd

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp184B.tmp

Filesize
1KB

MD5
876b9894e54444425dcb2da4578677ca

SHA1
ba1fd23088fd7de15f31f01ff4b001974a5981c7

SHA256
bf8113adbce988a1022345dc2d63fa0f4c49d769bbd55c5f3a342813882fa3f7

SHA512
3b3c65c8c5162e83fa96a3229da75de4a1d25d15da432fe5f910788762a2c0a2a5e6d67c5042b716736d0632962d6c632db86864f6ec02a2cdfe0fdfdeef357a

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpC9F7.tmp

Filesize
1KB

MD5
876b9894e54444425dcb2da4578677ca

SHA1
ba1fd23088fd7de15f31f01ff4b001974a5981c7

SHA256
bf8113adbce988a1022345dc2d63fa0f4c49d769bbd55c5f3a342813882fa3f7

SHA512
3b3c65c8c5162e83fa96a3229da75de4a1d25d15da432fe5f910788762a2c0a2a5e6d67c5042b716736d0632962d6c632db86864f6ec02a2cdfe0fdfdeef357a

Download Submit
C:\Windows\SysWOW64\SubDir\Client.exe

Filesize
927KB

MD5
d9f78b702ec7fd8a246103fe2eae5704

SHA1
90617fe3b2a7c71e6531eaa6b602c3ef86b3237d

SHA256
b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4

SHA512
1be56e8d51aa911acf2159ab9c04ae98b3bd7ee5e28a295d20f23b6918bf005d2e45314ae01dccce404e93f7146dd7b2d5b1b4119674560eab52e3a23f2f8aad

Download Submit
C:\Windows\SysWOW64\SubDir\Client.exe

Filesize
927KB

MD5
d9f78b702ec7fd8a246103fe2eae5704

SHA1
90617fe3b2a7c71e6531eaa6b602c3ef86b3237d

SHA256
b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4

SHA512
1be56e8d51aa911acf2159ab9c04ae98b3bd7ee5e28a295d20f23b6918bf005d2e45314ae01dccce404e93f7146dd7b2d5b1b4119674560eab52e3a23f2f8aad

Download Submit
C:\Windows\SysWOW64\SubDir\Client.exe

Filesize
927KB

MD5
d9f78b702ec7fd8a246103fe2eae5704

SHA1
90617fe3b2a7c71e6531eaa6b602c3ef86b3237d

SHA256
b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4

SHA512
1be56e8d51aa911acf2159ab9c04ae98b3bd7ee5e28a295d20f23b6918bf005d2e45314ae01dccce404e93f7146dd7b2d5b1b4119674560eab52e3a23f2f8aad

Download Submit
memory/2608-135-0x0000000009380000-0x000000000941C000-memory.dmp

Filesize
624KB

Download
memory/2608-136-0x0000000009520000-0x0000000009586000-memory.dmp

Filesize
408KB

Download
memory/2608-130-0x0000000000180000-0x000000000026E000-memory.dmp

Filesize
952KB

Download
memory/2608-134-0x0000000008AD0000-0x0000000008FFC000-memory.dmp

Filesize
5.2MB

Download
memory/2608-133-0x0000000004CB0000-0x0000000004CBA000-memory.dmp

Filesize
40KB

Download
memory/2608-132-0x0000000004C10000-0x0000000004CA2000-memory.dmp

Filesize
584KB

Download
memory/2608-131-0x00000000052C0000-0x0000000005864000-memory.dmp

Filesize
5.6MB

Download
memory/4468-140-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads