quasar | b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4

Analysis

max time kernel
96s
max time network
45s
platform
windows7_x64
resource
win7-20220414-en
submitted
15-04-2022 08:48

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
Size

927KB
MD5

d9f78b702ec7fd8a246103fe2eae5704
SHA1

90617fe3b2a7c71e6531eaa6b602c3ef86b3237d
SHA256

b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4
SHA512

1be56e8d51aa911acf2159ab9c04ae98b3bd7ee5e28a295d20f23b6918bf005d2e45314ae01dccce404e93f7146dd7b2d5b1b4119674560eab52e3a23f2f8aad

Score

10^/10

quasar office04 evasion spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

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

Quasar Payload 7 IoCs

resource	yara_rule
behavioral1/memory/1504-63-0x0000000000400000-0x0000000000484000-memory.dmp	family_quasar
behavioral1/memory/1504-62-0x0000000000400000-0x0000000000484000-memory.dmp	family_quasar
behavioral1/memory/1504-65-0x000000000047E78E-mapping.dmp	family_quasar
behavioral1/memory/1504-69-0x0000000000400000-0x0000000000484000-memory.dmp	family_quasar
behavioral1/memory/1504-67-0x0000000000400000-0x0000000000484000-memory.dmp	family_quasar
behavioral1/memory/1504-64-0x0000000000400000-0x0000000000484000-memory.dmp	family_quasar
behavioral1/memory/1092-84-0x000000000047E78E-mapping.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
1704	Client.exe
1092	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

Loads dropped DLL 2 IoCs

pid	Process
1504	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
1704	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	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	Client.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	Client.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 776 set thread context of 1504	776	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	31
PID 1704 set thread context of 1092	1704	Client.exe	35

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
1184	schtasks.exe
316	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1092	Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1504	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
Token: SeDebugPrivilege	1092	Client.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 776 wrote to memory of 1184	776	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	29
PID 776 wrote to memory of 1184	776	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	29
PID 776 wrote to memory of 1184	776	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	29
PID 776 wrote to memory of 1184	776	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	29
PID 776 wrote to memory of 1504	776	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	31
PID 776 wrote to memory of 1504	776	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	31
PID 776 wrote to memory of 1504	776	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	31
PID 776 wrote to memory of 1504	776	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	31
PID 776 wrote to memory of 1504	776	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	31
PID 776 wrote to memory of 1504	776	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	31
PID 776 wrote to memory of 1504	776	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	31
PID 776 wrote to memory of 1504	776	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	31
PID 776 wrote to memory of 1504	776	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	31
PID 1504 wrote to memory of 1704	1504	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	32
PID 1504 wrote to memory of 1704	1504	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	32
PID 1504 wrote to memory of 1704	1504	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	32
PID 1504 wrote to memory of 1704	1504	b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe	32
PID 1704 wrote to memory of 316	1704	Client.exe	33
PID 1704 wrote to memory of 316	1704	Client.exe	33
PID 1704 wrote to memory of 316	1704	Client.exe	33
PID 1704 wrote to memory of 316	1704	Client.exe	33
PID 1704 wrote to memory of 1092	1704	Client.exe	35
PID 1704 wrote to memory of 1092	1704	Client.exe	35
PID 1704 wrote to memory of 1092	1704	Client.exe	35
PID 1704 wrote to memory of 1092	1704	Client.exe	35
PID 1704 wrote to memory of 1092	1704	Client.exe	35
PID 1704 wrote to memory of 1092	1704	Client.exe	35
PID 1704 wrote to memory of 1092	1704	Client.exe	35
PID 1704 wrote to memory of 1092	1704	Client.exe	35
PID 1704 wrote to memory of 1092	1704	Client.exe	35

C:\Users\Admin\AppData\Local\Temp\b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
"C:\Users\Admin\AppData\Local\Temp\b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe"
1⤵
- Checks BIOS information in registry
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:776
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\aIXlnuuTVgzHfQ" /XML "C:\Users\Admin\AppData\Local\Temp\tmpD173.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1184
- C:\Users\Admin\AppData\Local\Temp\b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4.exe
  "{path}"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1504
- - C:\Windows\SysWOW64\SubDir\Client.exe
    "C:\Windows\system32\SubDir\Client.exe"
    3⤵
    - Executes dropped EXE
    - Checks BIOS information in registry
    - Loads dropped DLL
    - Maps connected drives based on registry
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:1704
  - - C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\aIXlnuuTVgzHfQ" /XML "C:\Users\Admin\AppData\Local\Temp\tmp896C.tmp"
      4⤵
      Creates scheduled task(s)
      PID:316
  - - C:\Windows\SysWOW64\SubDir\Client.exe
      "{path}"
      4⤵
      Executes dropped EXE
      Drops file in System32 directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1092

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\tmp896C.tmp

Filesize
1KB

MD5
4d311e615c191578cb56ffe0b33b4b2b

SHA1
e138b3545d6a750218e023d4620be78f5aacaa50

SHA256
5b3bc78e41e52930f414561c9b2c338f75e7625db05765f6a89357113fa4ead1

SHA512
5d2706e37420355a4355b59d81ca9fb159adff4209c25bb84620d9461f95b4c00f8191fb08ef7bb6c40e3d72673bfb6d8837de886bbecf3e4ec4eae0eea8ff62

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpD173.tmp

Filesize
1KB

MD5
4d311e615c191578cb56ffe0b33b4b2b

SHA1
e138b3545d6a750218e023d4620be78f5aacaa50

SHA256
5b3bc78e41e52930f414561c9b2c338f75e7625db05765f6a89357113fa4ead1

SHA512
5d2706e37420355a4355b59d81ca9fb159adff4209c25bb84620d9461f95b4c00f8191fb08ef7bb6c40e3d72673bfb6d8837de886bbecf3e4ec4eae0eea8ff62

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
\Windows\SysWOW64\SubDir\Client.exe

Filesize
927KB

MD5
d9f78b702ec7fd8a246103fe2eae5704

SHA1
90617fe3b2a7c71e6531eaa6b602c3ef86b3237d

SHA256
b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4

SHA512
1be56e8d51aa911acf2159ab9c04ae98b3bd7ee5e28a295d20f23b6918bf005d2e45314ae01dccce404e93f7146dd7b2d5b1b4119674560eab52e3a23f2f8aad

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

Filesize
927KB

MD5
d9f78b702ec7fd8a246103fe2eae5704

SHA1
90617fe3b2a7c71e6531eaa6b602c3ef86b3237d

SHA256
b75e201244597308d908a3464c0df0f99c27eb360c5851fcd0ca100c23115df4

SHA512
1be56e8d51aa911acf2159ab9c04ae98b3bd7ee5e28a295d20f23b6918bf005d2e45314ae01dccce404e93f7146dd7b2d5b1b4119674560eab52e3a23f2f8aad

Download Submit
memory/776-54-0x0000000000F20000-0x000000000100E000-memory.dmp

Filesize
952KB

Download
memory/776-56-0x00000000081C0000-0x000000000826E000-memory.dmp

Filesize
696KB

Download
memory/776-55-0x0000000000AF0000-0x0000000000B0C000-memory.dmp

Filesize
112KB

Download
memory/1504-59-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1504-64-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1504-67-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1504-69-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1504-62-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1504-63-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1504-60-0x0000000000400000-0x0000000000484000-memory.dmp

Filesize
528KB

Download
memory/1704-74-0x0000000000B40000-0x0000000000C2E000-memory.dmp

Filesize
952KB

Download