quasar | 832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105

Analysis

max time kernel
150s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
30-12-2024 00:43

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General

Target

832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
Size

3.2MB
MD5

a385e16864e1ac30f23dd08e87b93319
SHA1

987c3448486e401936e928abc52cf80780fb2d37
SHA256

832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105
SHA512

e2099df125c1ca9dfbaddd6ec89dadf94fcce7dd8c298958a53a8b0d0e52d91c0b26f8d1746ec72d5527594d678ec19c29f4849994d268fbdb6200a5c13c7699
SSDEEP

49152:tgviI22SsaNYfdPBldt698dBcjHq1SQoGv5lpTHHB72eh2NTf:mvv22SsaNYfdPBldt6+dBcjHq19x8

Score

10^/10

quasar office04 discovery evasion persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

193.161.193.99:43242

Mutex

45bfb701-bea2-411a-948d-9a6abe001f83

Attributes

encryption_key
80594967BC0A4839C316A44D62DE36E9BF18177F
install_name
SYSTEM26.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	svchost.exe

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral2/files/0x0007000000023c8c-7.dat	family_quasar
behavioral2/memory/1880-10-0x0000000000DC0000-0x00000000010E4000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c8f-26.dat	family_quasar

Executes dropped EXE 8 IoCs

pid	Process
1880	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2968	icsys.icn.exe
2284	explorer.exe
2280	SYSTEM26.exe
2784	spoolsv.exe
3856	svchost.exe
1984	spoolsv.exe
1932	system26.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\resources\\themes\\explorer.exe RO"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\resources\\svchost.exe RO"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\resources\\themes\\explorer.exe RO"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\resources\\svchost.exe RO"	svchost.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\explorer.exe	explorer.exe
File opened for modification	C:\Windows\SysWOW64\explorer.exe	svchost.exe

Drops file in Windows directory 6 IoCs

description	ioc	Process
File opened for modification	\??\c:\windows\resources\spoolsv.exe	explorer.exe
File opened for modification	\??\c:\windows\resources\svchost.exe	spoolsv.exe
File opened for modification	C:\Windows\Resources\Themes\icsys.icn.exe	SYSTEM26.exe
File opened for modification	C:\Windows\Resources\tjud.exe	explorer.exe
File opened for modification	C:\Windows\Resources\Themes\icsys.icn.exe	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
File opened for modification	\??\c:\windows\resources\themes\explorer.exe	icsys.icn.exe

System Location Discovery: System Language Discovery 1 TTPs 7 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	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icsys.icn.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	SYSTEM26.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	explorer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3944	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2968	icsys.icn.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
2284	explorer.exe
3856	svchost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1880	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
Token: SeDebugPrivilege	1932	system26.exe

Suspicious use of SetWindowsHookEx 14 IoCs

pid	Process
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
2968	icsys.icn.exe
2968	icsys.icn.exe
2284	explorer.exe
2284	explorer.exe
2280	SYSTEM26.exe
2280	SYSTEM26.exe
2784	spoolsv.exe
2784	spoolsv.exe
3856	svchost.exe
3856	svchost.exe
1984	spoolsv.exe
1984	spoolsv.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2972 wrote to memory of 1880	2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe	83
PID 2972 wrote to memory of 1880	2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe	83
PID 1880 wrote to memory of 3944	1880	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe	84
PID 1880 wrote to memory of 3944	1880	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe	84
PID 2972 wrote to memory of 2968	2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe	86
PID 2972 wrote to memory of 2968	2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe	86
PID 2972 wrote to memory of 2968	2972	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe	86
PID 2968 wrote to memory of 2284	2968	icsys.icn.exe	88
PID 2968 wrote to memory of 2284	2968	icsys.icn.exe	88
PID 2968 wrote to memory of 2284	2968	icsys.icn.exe	88
PID 1880 wrote to memory of 2280	1880	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe	87
PID 1880 wrote to memory of 2280	1880	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe	87
PID 1880 wrote to memory of 2280	1880	832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe	87
PID 2284 wrote to memory of 2784	2284	explorer.exe	89
PID 2284 wrote to memory of 2784	2284	explorer.exe	89
PID 2284 wrote to memory of 2784	2284	explorer.exe	89
PID 2784 wrote to memory of 3856	2784	spoolsv.exe	90
PID 2784 wrote to memory of 3856	2784	spoolsv.exe	90
PID 2784 wrote to memory of 3856	2784	spoolsv.exe	90
PID 3856 wrote to memory of 1984	3856	svchost.exe	92
PID 3856 wrote to memory of 1984	3856	svchost.exe	92
PID 3856 wrote to memory of 1984	3856	svchost.exe	92
PID 2280 wrote to memory of 1932	2280	SYSTEM26.exe	91
PID 2280 wrote to memory of 1932	2280	SYSTEM26.exe	91

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

C:\Users\Admin\AppData\Local\Temp\832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
"C:\Users\Admin\AppData\Local\Temp\832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe"
1⤵
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2972
- \??\c:\users\admin\appdata\local\temp\832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
  c:\users\admin\appdata\local\temp\832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1880
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\SYSTEM26.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3944
- - C:\Users\Admin\AppData\Roaming\SubDir\SYSTEM26.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\SYSTEM26.exe"
    3⤵
    - Executes dropped EXE
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2280
  - - \??\c:\users\admin\appdata\roaming\subdir\system26.exe
      c:\users\admin\appdata\roaming\subdir\system26.exe
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      PID:1932
- C:\Windows\Resources\Themes\icsys.icn.exe
  C:\Windows\Resources\Themes\icsys.icn.exe
  2⤵
  - Executes dropped EXE
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2968
- - \??\c:\windows\resources\themes\explorer.exe
    c:\windows\resources\themes\explorer.exe
    3⤵
    - Modifies visiblity of hidden/system files in Explorer
    - Executes dropped EXE
    - Adds Run key to start application
    - Drops file in System32 directory
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2284
  - - \??\c:\windows\resources\spoolsv.exe
      c:\windows\resources\spoolsv.exe SE
      4⤵
      Executes dropped EXE
      Drops file in Windows directory
      System Location Discovery: System Language Discovery
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:2784
    - - \??\c:\windows\resources\svchost.exe
        
        c:\windows\resources\svchost.exe
        5⤵
        Modifies visiblity of hidden/system files in Explorer
        Executes dropped EXE
        Adds Run key to start application
        Drops file in System32 directory
        System Location Discovery: System Language Discovery
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:3856
      - \??\c:\windows\resources\spoolsv.exe
        
        c:\windows\resources\spoolsv.exe PR
        6⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        
        PID:1984

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105.exe

Filesize
3.1MB

MD5
be5735282826036dcacc522c081365a0

SHA1
310bba5786ba8a4087cb8045ea699279a434a818

SHA256
78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11

SHA512
0fecccb5dd1ecfc0eba3dc89e078b2210ea6299d0f60cdd7bade885872cd07f6bbf041b98924054b71d35d94e56e3004ac825c5f2f9feb7f18758fad25c3b2f3

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\SYSTEM26.exe

Filesize
3.2MB

MD5
a385e16864e1ac30f23dd08e87b93319

SHA1
987c3448486e401936e928abc52cf80780fb2d37

SHA256
832c978576aca4163e3c3127e622316794836b1e634b4128797fc9493ff57105

SHA512
e2099df125c1ca9dfbaddd6ec89dadf94fcce7dd8c298958a53a8b0d0e52d91c0b26f8d1746ec72d5527594d678ec19c29f4849994d268fbdb6200a5c13c7699

Download Submit
C:\Windows\Resources\Themes\explorer.exe

Filesize
135KB

MD5
6d6193e45980ad825c01611bfe988f41

SHA1
2bedd8025c1e85f24bc164d99159ca95a98c686b

SHA256
7952c3aacc0746733e5e7e616f8f022ff63fb061d6fd38a3ea40240ec77bf1a5

SHA512
bfbc6e50e41ea59eb1fc664585f382fba3d9444c23cd6c2f451a39084acf9b9b5372294d2d583eba320c4bc692d8caa5ed5558c87e98ad796faee49337a2e006

Download Submit
C:\Windows\Resources\Themes\icsys.icn.exe

Filesize
135KB

MD5
85e6eabfb02501e476f648949e2b5ac7

SHA1
67138a5f2b5746557d351d49dc5f7a3c118a8e34

SHA256
94a03f2cdb7cb5d78e35c291c091c4d457b07b4bd7c7030b43324e57e7abf28d

SHA512
3dd2db7680e520f3f4c86b2dbae2d72c1758845469df92e38d080e97e6187ae8d2463ebeafb1420e8762734f466a8ce6cdb70b7268c8e046d9cd29cac86c409b

Download Submit
\??\c:\windows\resources\spoolsv.exe

Filesize
135KB

MD5
e7c889be6322218401cfe5a0018ac416

SHA1
e34a6d8624f82a098975517f6ae3c17804253807

SHA256
f1b448be1ae719590f0a875f52fcce6ef46c0c6c678958ca63c09549ec14931b

SHA512
74cc70b9c19088ab893e1c1e3e5afca4d504ec04726452dc85233373cd6a788ecef8ce8d094eed9eb67c027f1b7ab1c37111682ee6f6339e23de0bdf2437db00

Download Submit
\??\c:\windows\resources\svchost.exe

Filesize
135KB

MD5
abe408ccda6b28920df6953f354892f5

SHA1
b2bfeb035745106538a945e30ee9cefd62e0715b

SHA256
a8f7373289034f92f50c54c9d84220595ecb4a3a160f42b0a6cf065b84d5ee86

SHA512
1051f3b92f53666449ce5dbd2af202afdc8bf4f15d137c11696307d6a7fc4d5e0e428762d09dec5546b07fc4869ea634ef3a72c9ec94f98ed071cf5adc4e5a58

Download Submit
memory/1880-33-0x00007FFE6D830000-0x00007FFE6E2F1000-memory.dmp

Filesize
10.8MB

Download
memory/1880-11-0x00007FFE6D830000-0x00007FFE6E2F1000-memory.dmp

Filesize
10.8MB

Download
memory/1880-10-0x0000000000DC0000-0x00000000010E4000-memory.dmp

Filesize
3.1MB

Download
memory/1880-9-0x00007FFE6D833000-0x00007FFE6D835000-memory.dmp

Filesize
8KB

Download
memory/1984-61-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2280-65-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2284-66-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2784-42-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2784-62-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

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memory/2968-64-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

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memory/2972-0-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

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memory/2972-63-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

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memory/3856-67-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

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