quasar | c9d37a723484c763c7c25000eb11c7bb9cda571a8c2b7886f4610af6cd473047

Analysis

max time kernel
140s
max time network
141s
platform
windows10-2004_x64
resource
win10v2004-20240419-en
resource tags

arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
submitted
01/05/2024, 16:11

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General

Target
4921d7a6d49401873cff200a4f3d990d.exe
Size 9.0MB
Sample240501-tmym7ada69
SHA256 c9d37a723484c763c7c25000eb11c7bb9cda571a8c2b7886f4610af6cd473047
MD5 4921d7a6d49401873cff200a4f3d990d
SHA1 3d008d53e798505b858ff48574f3080210c56e27
SHA512 9bc506b0615f3e7ba18ed70c92bef4dff257aad5437f17670ba88d8aec1ce20b0b46f8c194918e2c0fa0fa0397ec0ef2f954801da09fbf211c8597936fc097c4
SSDEEP 98304:F6D7RBxsErIVyJTk8LJ5i4J/OCV4HEZFrp:QRw08yJIC5uuT
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

93.123.85.108:4782

Mutex

e14b8f59-979b-4ebf-8602-dd3c4d6c301e

Attributes

encryption_key
534734397C0FA9A1D28F061AD75DF4100BFF5787
install_name
Msconfig.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/3404-16-0x0000000001460000-0x0000000001784000-memory.dmp	family_quasar

Executes dropped EXE 2 IoCs

pid	Process
1604	msconfig.exe
1272	msconfig.exe

Suspicious use of SetThreadContext 5 IoCs

description	pid	Process	procid_target
PID 4668 set thread context of 1952	4668	4921d7a6d49401873cff200a4f3d990d.exe	99
PID 1952 set thread context of 3404	1952	csc.exe	109
PID 1604 set thread context of 452	1604	msconfig.exe	121
PID 452 set thread context of 1692	452	csc.exe	138
PID 1272 set thread context of 3536	1272	msconfig.exe	146

Creates scheduled task(s) 1 TTPs 5 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
4192	schtasks.exe
2348	schtasks.exe
632	schtasks.exe
2344	schtasks.exe
776	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3404	csc.exe
Token: SeDebugPrivilege	1692	csc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3404	csc.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 4668 wrote to memory of 1952	4668	4921d7a6d49401873cff200a4f3d990d.exe	99
PID 4668 wrote to memory of 1952	4668	4921d7a6d49401873cff200a4f3d990d.exe	99
PID 4668 wrote to memory of 1952	4668	4921d7a6d49401873cff200a4f3d990d.exe	99
PID 4668 wrote to memory of 1952	4668	4921d7a6d49401873cff200a4f3d990d.exe	99
PID 4668 wrote to memory of 1952	4668	4921d7a6d49401873cff200a4f3d990d.exe	99
PID 4668 wrote to memory of 1952	4668	4921d7a6d49401873cff200a4f3d990d.exe	99
PID 4668 wrote to memory of 1952	4668	4921d7a6d49401873cff200a4f3d990d.exe	99
PID 4668 wrote to memory of 1952	4668	4921d7a6d49401873cff200a4f3d990d.exe	99
PID 4668 wrote to memory of 1832	4668	4921d7a6d49401873cff200a4f3d990d.exe	100
PID 4668 wrote to memory of 1832	4668	4921d7a6d49401873cff200a4f3d990d.exe	100
PID 4668 wrote to memory of 1832	4668	4921d7a6d49401873cff200a4f3d990d.exe	100
PID 4668 wrote to memory of 2524	4668	4921d7a6d49401873cff200a4f3d990d.exe	102
PID 4668 wrote to memory of 2524	4668	4921d7a6d49401873cff200a4f3d990d.exe	102
PID 4668 wrote to memory of 2524	4668	4921d7a6d49401873cff200a4f3d990d.exe	102
PID 2524 wrote to memory of 4192	2524	cmd.exe	104
PID 2524 wrote to memory of 4192	2524	cmd.exe	104
PID 2524 wrote to memory of 4192	2524	cmd.exe	104
PID 4668 wrote to memory of 2176	4668	4921d7a6d49401873cff200a4f3d990d.exe	105
PID 4668 wrote to memory of 2176	4668	4921d7a6d49401873cff200a4f3d990d.exe	105
PID 4668 wrote to memory of 2176	4668	4921d7a6d49401873cff200a4f3d990d.exe	105
PID 1952 wrote to memory of 3404	1952	csc.exe	109
PID 1952 wrote to memory of 3404	1952	csc.exe	109
PID 1952 wrote to memory of 3404	1952	csc.exe	109
PID 1952 wrote to memory of 3404	1952	csc.exe	109
PID 1952 wrote to memory of 3404	1952	csc.exe	109
PID 1952 wrote to memory of 3404	1952	csc.exe	109
PID 1952 wrote to memory of 3404	1952	csc.exe	109
PID 1952 wrote to memory of 3404	1952	csc.exe	109
PID 1952 wrote to memory of 4372	1952	csc.exe	110
PID 1952 wrote to memory of 4372	1952	csc.exe	110
PID 1952 wrote to memory of 4372	1952	csc.exe	110
PID 1952 wrote to memory of 1044	1952	csc.exe	112
PID 1952 wrote to memory of 1044	1952	csc.exe	112
PID 1952 wrote to memory of 1044	1952	csc.exe	112
PID 1044 wrote to memory of 2348	1044	cmd.exe	114
PID 1044 wrote to memory of 2348	1044	cmd.exe	114
PID 1044 wrote to memory of 2348	1044	cmd.exe	114
PID 1952 wrote to memory of 916	1952	csc.exe	115
PID 1952 wrote to memory of 916	1952	csc.exe	115
PID 1952 wrote to memory of 916	1952	csc.exe	115
PID 1604 wrote to memory of 452	1604	msconfig.exe	121
PID 1604 wrote to memory of 452	1604	msconfig.exe	121
PID 1604 wrote to memory of 452	1604	msconfig.exe	121
PID 1604 wrote to memory of 452	1604	msconfig.exe	121
PID 1604 wrote to memory of 452	1604	msconfig.exe	121
PID 1604 wrote to memory of 452	1604	msconfig.exe	121
PID 1604 wrote to memory of 452	1604	msconfig.exe	121
PID 1604 wrote to memory of 452	1604	msconfig.exe	121
PID 1604 wrote to memory of 4732	1604	msconfig.exe	122
PID 1604 wrote to memory of 4732	1604	msconfig.exe	122
PID 1604 wrote to memory of 4732	1604	msconfig.exe	122
PID 1604 wrote to memory of 3560	1604	msconfig.exe	124
PID 1604 wrote to memory of 3560	1604	msconfig.exe	124
PID 1604 wrote to memory of 3560	1604	msconfig.exe	124
PID 3560 wrote to memory of 632	3560	cmd.exe	126
PID 3560 wrote to memory of 632	3560	cmd.exe	126
PID 3560 wrote to memory of 632	3560	cmd.exe	126
PID 1604 wrote to memory of 776	1604	msconfig.exe	127
PID 1604 wrote to memory of 776	1604	msconfig.exe	127
PID 1604 wrote to memory of 776	1604	msconfig.exe	127
PID 452 wrote to memory of 1692	452	csc.exe	138
PID 452 wrote to memory of 1692	452	csc.exe	138
PID 452 wrote to memory of 1692	452	csc.exe	138
PID 452 wrote to memory of 1692	452	csc.exe	138

C:\Users\Admin\AppData\Local\Temp\4921d7a6d49401873cff200a4f3d990d.exe
"C:\Users\Admin\AppData\Local\Temp\4921d7a6d49401873cff200a4f3d990d.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4668
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:1952
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:3404
- - C:\Windows\SysWOW64\cmd.exe
    "cmd.exe" /C mkdir "C:\Users\Admin\AppData\Roaming\msconfig"
    3⤵
    PID:4372
- - C:\Windows\SysWOW64\cmd.exe
    "cmd.exe" /C schtasks /create /sc minute /mo 1 /tn "Nafifas" /tr "'C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe'" /f
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1044
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /sc minute /mo 1 /tn "Nafifas" /tr "'C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe'" /f
      4⤵
      Creates scheduled task(s)
      PID:2348
- - C:\Windows\SysWOW64\cmd.exe
    "cmd.exe" /C copy "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" "C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe"
    3⤵
    PID:916
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C mkdir "C:\Users\Admin\AppData\Roaming\msconfig"
  2⤵
  PID:1832
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C schtasks /create /sc minute /mo 1 /tn "Nafifas" /tr "'C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe'" /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2524
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /sc minute /mo 1 /tn "Nafifas" /tr "'C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe'" /f
    3⤵
    - Creates scheduled task(s)
    PID:4192
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C copy "C:\Users\Admin\AppData\Local\Temp\4921d7a6d49401873cff200a4f3d990d.exe" "C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe"
  2⤵
  PID:2176

C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe
C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1604
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:452
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:1692
- - C:\Windows\SysWOW64\cmd.exe
    "cmd.exe" /C mkdir "C:\Users\Admin\AppData\Roaming\msconfig"
    3⤵
    PID:2736
- - C:\Windows\SysWOW64\cmd.exe
    "cmd.exe" /C schtasks /create /sc minute /mo 1 /tn "Nafifas" /tr "'C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe'" /f
    3⤵
    PID:636
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /sc minute /mo 1 /tn "Nafifas" /tr "'C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe'" /f
      4⤵
      Creates scheduled task(s)
      PID:2344
- - C:\Windows\SysWOW64\cmd.exe
    "cmd.exe" /C copy "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" "C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe"
    3⤵
    PID:1200
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C mkdir "C:\Users\Admin\AppData\Roaming\msconfig"
  2⤵
  PID:4732
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C schtasks /create /sc minute /mo 1 /tn "Nafifas" /tr "'C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe'" /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3560
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /sc minute /mo 1 /tn "Nafifas" /tr "'C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe'" /f
    3⤵
    - Creates scheduled task(s)
    PID:632
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C copy "C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe" "C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe"
  2⤵
  PID:776

C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe
C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
PID:1272
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"
  2⤵
  PID:3536
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C mkdir "C:\Users\Admin\AppData\Roaming\msconfig"
  2⤵
  PID:3680
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C schtasks /create /sc minute /mo 1 /tn "Nafifas" /tr "'C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe'" /f
  2⤵
  PID:3256
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /sc minute /mo 1 /tn "Nafifas" /tr "'C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe'" /f
    3⤵
    - Creates scheduled task(s)
    PID:776
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C copy "C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe" "C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe"
  2⤵
  PID:3284

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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csc.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\csc.exe.log
Size 520B
SHA256 5164770a37b199a79ccd23b399bb3309228973d9f74c589bc2623dc613b37ac4
MD5 03febbff58da1d3318c31657d89c8542
SHA1 c9e017bd9d0a4fe533795b227c855935d86c2092
SHA512 3750c372bbca1892e9c1b34681d592c693e725a8b149c3d6938079cd467628cec42c4293b0d886b57a786abf45f5e7229247b3445001774e3e793ff5a3accfa3
MD5 SHA1 SHA512

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msconfig.exe

Path C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe
Size 9.0MB
SHA256 c9d37a723484c763c7c25000eb11c7bb9cda571a8c2b7886f4610af6cd473047
MD5 4921d7a6d49401873cff200a4f3d990d
SHA1 3d008d53e798505b858ff48574f3080210c56e27
SHA512 9bc506b0615f3e7ba18ed70c92bef4dff257aad5437f17670ba88d8aec1ce20b0b46f8c194918e2c0fa0fa0397ec0ef2f954801da09fbf211c8597936fc097c4
SSDEEP 98304:F6D7RBxsErIVyJTk8LJ5i4J/OCV4HEZFrp:QRw08yJIC5uuT
MD5 SHA1 SHA512 SSDEEP

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memory/1952-7-0x0000000075200000-0x00000000759B0000-memory.dmp

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memory/1952-19-0x0000000075200000-0x00000000759B0000-memory.dmp

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memory/1952-15-0x0000000075200000-0x00000000759B0000-memory.dmp

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memory/1952-8-0x0000000075200000-0x00000000759B0000-memory.dmp

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memory/1952-6-0x0000000001200000-0x000000000152A000-memory.dmp

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memory/3404-20-0x0000000005EE0000-0x0000000005EEA000-memory.dmp

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memory/3404-21-0x00000000071E0000-0x00000000077F8000-memory.dmp

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memory/3404-26-0x0000000008690000-0x00000000086F6000-memory.dmp

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memory/3404-25-0x00000000083E0000-0x000000000841C000-memory.dmp

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memory/3404-24-0x0000000008380000-0x0000000008392000-memory.dmp

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memory/3404-16-0x0000000001460000-0x0000000001784000-memory.dmp

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memory/3404-17-0x0000000005F80000-0x0000000006012000-memory.dmp

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memory/3404-23-0x0000000006E10000-0x0000000006EC2000-memory.dmp

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memory/3404-22-0x0000000006BC0000-0x0000000006C10000-memory.dmp

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memory/4668-3-0x0000000075200000-0x00000000759B0000-memory.dmp

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memory/4668-0-0x000000007520E000-0x000000007520F000-memory.dmp

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memory/4668-2-0x0000000005C10000-0x00000000061B4000-memory.dmp

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memory/4668-5-0x0000000075200000-0x00000000759B0000-memory.dmp

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memory/4668-4-0x000000007520E000-0x000000007520F000-memory.dmp

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memory/4668-12-0x0000000075200000-0x00000000759B0000-memory.dmp

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memory/4668-1-0x00000000003F0000-0x0000000000CFE000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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