quasar | 4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749

Analysis

max time kernel
136s
max time network
145s
platform
windows7_x64
resource
win7-20241023-en
resource tags

arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
submitted
08-11-2024 22:24

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General

Target

4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe
Size

3.7MB
MD5

10543f9aaa9c0bf4085301bc7614ac20
SHA1

1561a634d02baaa557032b40f95b191deedb67d0
SHA256

4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749
SHA512

320dae470f3b5ad983b55fbaeb437daed163cea4a5166dd7c606012d9f21cb516b15d91e171469a594cf2522a71b0af367fe0b3c94cd9e2432570858280ec55e
SSDEEP

98304:FOH+wWNUsUX/WWxvy0GzbNPFZACmedrm:cewYUXX/TxvSzj5/

Score

10^/10

quasar code discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

CODE

twart.myfirewall.org:9792

rency.ydns.eu:5287

wqo9.firewall-gateway.de:8841

Mutex

02351e291-5d041-4fa37-932c7-869aeiQec514992

Attributes

encryption_key
3145298725BA5E0DD56E87FFE3F8898EA81E6EDA
install_name
workbook.exe
log_directory
Logs
reconnect_delay
6000
startup_key
workbook
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 5 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2716-9-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar
behavioral1/memory/2716-17-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar
behavioral1/memory/2716-15-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar
behavioral1/memory/2716-13-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar
behavioral1/memory/2716-10-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar

Executes dropped EXE 2 IoCs

Processes:

workbook.exeworkbook.exe

pid	Process
1036	workbook.exe
2476	workbook.exe

Loads dropped DLL 1 IoCs

Processes:

4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe

pid	Process
2716	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exeworkbook.exe

description	pid	Process	procid_target
PID 2816 set thread context of 2716	2816	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	31
PID 1036 set thread context of 2476	1036	workbook.exe	35

System Location Discovery: System Language Discovery 1 TTPs 6 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

Processes:

workbook.exeworkbook.exeschtasks.exe4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exeschtasks.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	workbook.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	workbook.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

Processes:

schtasks.exeschtasks.exe

pid	Process
2172	schtasks.exe
2432	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exeworkbook.exe

description	pid	Process
Token: SeDebugPrivilege	2716	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe
Token: SeDebugPrivilege	2476	workbook.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

workbook.exe

pid	Process
2476	workbook.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exeworkbook.exeworkbook.exe

description	pid	Process	procid_target
PID 2816 wrote to memory of 2716	2816	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	31
PID 2816 wrote to memory of 2716	2816	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	31
PID 2816 wrote to memory of 2716	2816	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	31
PID 2816 wrote to memory of 2716	2816	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	31
PID 2816 wrote to memory of 2716	2816	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	31
PID 2816 wrote to memory of 2716	2816	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	31
PID 2816 wrote to memory of 2716	2816	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	31
PID 2816 wrote to memory of 2716	2816	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	31
PID 2816 wrote to memory of 2716	2816	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	31
PID 2716 wrote to memory of 2172	2716	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	32
PID 2716 wrote to memory of 2172	2716	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	32
PID 2716 wrote to memory of 2172	2716	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	32
PID 2716 wrote to memory of 2172	2716	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	32
PID 2716 wrote to memory of 1036	2716	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	34
PID 2716 wrote to memory of 1036	2716	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	34
PID 2716 wrote to memory of 1036	2716	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	34
PID 2716 wrote to memory of 1036	2716	4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe	34
PID 1036 wrote to memory of 2476	1036	workbook.exe	35
PID 1036 wrote to memory of 2476	1036	workbook.exe	35
PID 1036 wrote to memory of 2476	1036	workbook.exe	35
PID 1036 wrote to memory of 2476	1036	workbook.exe	35
PID 1036 wrote to memory of 2476	1036	workbook.exe	35
PID 1036 wrote to memory of 2476	1036	workbook.exe	35
PID 1036 wrote to memory of 2476	1036	workbook.exe	35
PID 1036 wrote to memory of 2476	1036	workbook.exe	35
PID 1036 wrote to memory of 2476	1036	workbook.exe	35
PID 2476 wrote to memory of 2432	2476	workbook.exe	36
PID 2476 wrote to memory of 2432	2476	workbook.exe	36
PID 2476 wrote to memory of 2432	2476	workbook.exe	36
PID 2476 wrote to memory of 2432	2476	workbook.exe	36

C:\Users\Admin\AppData\Local\Temp\4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe
"C:\Users\Admin\AppData\Local\Temp\4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2816
- C:\Users\Admin\AppData\Local\Temp\4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe
  "C:\Users\Admin\AppData\Local\Temp\4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749.exe"
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2716
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "workbook" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2172
- - C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1036
  - - C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:2476
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "workbook" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe" /rl HIGHEST /f
        5⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:2432

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\workbook.exe

Filesize
3.7MB

MD5
10543f9aaa9c0bf4085301bc7614ac20

SHA1
1561a634d02baaa557032b40f95b191deedb67d0

SHA256
4b35788594f482786143f276de0942d2f73c416c8e0b1d104e848187cb604749

SHA512
320dae470f3b5ad983b55fbaeb437daed163cea4a5166dd7c606012d9f21cb516b15d91e171469a594cf2522a71b0af367fe0b3c94cd9e2432570858280ec55e

Download Submit
memory/1036-28-0x00000000013E0000-0x000000000179A000-memory.dmp

Filesize
3.7MB

Download
memory/2476-38-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2716-8-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2716-7-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2716-29-0x0000000073C30000-0x000000007431E000-memory.dmp

Filesize
6.9MB

Download
memory/2716-20-0x0000000073C30000-0x000000007431E000-memory.dmp

Filesize
6.9MB

Download
memory/2716-9-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2716-17-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2716-15-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2716-13-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2716-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2716-18-0x0000000073C30000-0x000000007431E000-memory.dmp

Filesize
6.9MB

Download
memory/2716-10-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2816-19-0x0000000073C30000-0x000000007431E000-memory.dmp

Filesize
6.9MB

Download
memory/2816-0-0x0000000073C3E000-0x0000000073C3F000-memory.dmp

Filesize
4KB

Download
memory/2816-4-0x0000000073C30000-0x000000007431E000-memory.dmp

Filesize
6.9MB

Download
memory/2816-6-0x000000000B190000-0x000000000B4F6000-memory.dmp

Filesize
3.4MB

Download
memory/2816-3-0x0000000073C3E000-0x0000000073C3F000-memory.dmp

Filesize
4KB

Download
memory/2816-2-0x0000000073C30000-0x000000007431E000-memory.dmp

Filesize
6.9MB

Download
memory/2816-5-0x0000000000260000-0x000000000027C000-memory.dmp

Filesize
112KB

Download
memory/2816-1-0x0000000001050000-0x000000000140A000-memory.dmp

Filesize
3.7MB

Download