quasar | 4b3430ba8a4388133716b3747f00e9a98c99f37631aac98a03ff6bc8b674cf1e

Analysis

max time kernel
123s
max time network
53s
platform
windows10-2004_x64
resource
win10v2004-20240419-en
resource tags

arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
submitted
30/04/2024, 03:41

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General

Target
Encrypted.exe
Size 9.0MB
Sample240430-d8832sca51
SHA256 4b3430ba8a4388133716b3747f00e9a98c99f37631aac98a03ff6bc8b674cf1e
MD5 78c78748cab54dcf941633f5297c1bf6
SHA1 0c0ee5e0694315bc3813c95d8561056dd8831bee
SHA512 d2212b83a7a4ca4d428cb200f45cc723f6f41485ffd7856f6eeba00f86996f584009e3f2fc5bb0230bfaa96e9c75ac08d3a0c56a07fa94b03b5b220e3e63458f
SSDEEP 49152:/D34Eaz/gdH5o3T8VNZXPkp33BbXh4cpybjPimb+GbZ16xViBGGxxedCCaU0Ddd9:/EsHiAKJxDhpYqemxkDTfgY
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/2532-7-0x0000000000900000-0x0000000000C24000-memory.dmp	family_quasar

Executes dropped EXE 4 IoCs

pid	Process
4304	Msconfig.exe
1972	msconfig.exe
1944	Msconfig.exe
3192	msconfig.exe

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Drops file in System32 directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\SubDir\Msconfig.exe	vbc.exe
File opened for modification	C:\Windows\SysWOW64\SubDir	vbc.exe
File created	C:\Windows\SysWOW64\SubDir\Msconfig.exe	vbc.exe
File opened for modification	C:\Windows\SysWOW64\SubDir\Msconfig.exe	vbc.exe
File opened for modification	C:\Windows\SysWOW64\SubDir	vbc.exe
File created	C:\Windows\SysWOW64\SubDir\Msconfig.exe	vbc.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1804 set thread context of 2532	1804	Encrypted.exe	90
PID 1972 set thread context of 3920	1972	msconfig.exe	107

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/Job

T1053

pid	Process
4396	schtasks.exe
4532	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2532	vbc.exe
Token: SeDebugPrivilege	3920	vbc.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 1804 wrote to memory of 2532	1804	Encrypted.exe	90
PID 1804 wrote to memory of 2532	1804	Encrypted.exe	90
PID 1804 wrote to memory of 2532	1804	Encrypted.exe	90
PID 1804 wrote to memory of 2532	1804	Encrypted.exe	90
PID 1804 wrote to memory of 2532	1804	Encrypted.exe	90
PID 1804 wrote to memory of 2532	1804	Encrypted.exe	90
PID 1804 wrote to memory of 2532	1804	Encrypted.exe	90
PID 1804 wrote to memory of 2532	1804	Encrypted.exe	90
PID 1804 wrote to memory of 2276	1804	Encrypted.exe	91
PID 1804 wrote to memory of 2276	1804	Encrypted.exe	91
PID 1804 wrote to memory of 2276	1804	Encrypted.exe	91
PID 1804 wrote to memory of 3440	1804	Encrypted.exe	93
PID 1804 wrote to memory of 3440	1804	Encrypted.exe	93
PID 1804 wrote to memory of 3440	1804	Encrypted.exe	93
PID 3440 wrote to memory of 4396	3440	cmd.exe	95
PID 3440 wrote to memory of 4396	3440	cmd.exe	95
PID 3440 wrote to memory of 4396	3440	cmd.exe	95
PID 1804 wrote to memory of 4648	1804	Encrypted.exe	96
PID 1804 wrote to memory of 4648	1804	Encrypted.exe	96
PID 1804 wrote to memory of 4648	1804	Encrypted.exe	96
PID 2532 wrote to memory of 4304	2532	vbc.exe	98
PID 2532 wrote to memory of 4304	2532	vbc.exe	98
PID 2532 wrote to memory of 4304	2532	vbc.exe	98
PID 1972 wrote to memory of 3920	1972	msconfig.exe	107
PID 1972 wrote to memory of 3920	1972	msconfig.exe	107
PID 1972 wrote to memory of 3920	1972	msconfig.exe	107
PID 1972 wrote to memory of 3920	1972	msconfig.exe	107
PID 1972 wrote to memory of 3920	1972	msconfig.exe	107
PID 1972 wrote to memory of 3920	1972	msconfig.exe	107
PID 1972 wrote to memory of 3920	1972	msconfig.exe	107
PID 1972 wrote to memory of 3920	1972	msconfig.exe	107
PID 1972 wrote to memory of 4984	1972	msconfig.exe	108
PID 1972 wrote to memory of 4984	1972	msconfig.exe	108
PID 1972 wrote to memory of 4984	1972	msconfig.exe	108
PID 1972 wrote to memory of 2768	1972	msconfig.exe	110
PID 1972 wrote to memory of 2768	1972	msconfig.exe	110
PID 1972 wrote to memory of 2768	1972	msconfig.exe	110
PID 2768 wrote to memory of 4532	2768	cmd.exe	112
PID 2768 wrote to memory of 4532	2768	cmd.exe	112
PID 2768 wrote to memory of 4532	2768	cmd.exe	112
PID 1972 wrote to memory of 1072	1972	msconfig.exe	113
PID 1972 wrote to memory of 1072	1972	msconfig.exe	113
PID 1972 wrote to memory of 1072	1972	msconfig.exe	113
PID 3920 wrote to memory of 1944	3920	vbc.exe	115
PID 3920 wrote to memory of 1944	3920	vbc.exe	115
PID 3920 wrote to memory of 1944	3920	vbc.exe	115

C:\Users\Admin\AppData\Local\Temp\Encrypted.exe
"C:\Users\Admin\AppData\Local\Temp\Encrypted.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1804
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2532
- - C:\Windows\SysWOW64\SubDir\Msconfig.exe
    "C:\Windows\system32\SubDir\Msconfig.exe"
    3⤵
    - Executes dropped EXE
    PID:4304
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C mkdir "C:\Users\Admin\AppData\Roaming\msconfig"
  2⤵
  PID:2276
- 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:3440
- - 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:4396
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C copy "C:\Users\Admin\AppData\Local\Temp\Encrypted.exe" "C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe"
  2⤵
  PID:4648

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:1972
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3920
- - C:\Windows\SysWOW64\SubDir\Msconfig.exe
    "C:\Windows\system32\SubDir\Msconfig.exe"
    3⤵
    - Executes dropped EXE
    PID:1944
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C mkdir "C:\Users\Admin\AppData\Roaming\msconfig"
  2⤵
  PID:4984
- 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:2768
- - 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:4532
- 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:1072

C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe
C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe
1⤵
- Executes dropped EXE
PID:3192

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scripting

T1064

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Scripting

T1064

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

msconfig.exe.log

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

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vbc.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\vbc.exe.log
Size 1KB
SHA256 8940500d6f057583903fde1af0287e27197410415639fc69beb39475fa5240dc
MD5 df27a876383bd81dfbcb457a9fa9f09d
SHA1 1bbc4ab95c89d02ec1d217f0255205787999164e
SHA512 fe68271375002cfcf8585c92b948ae47cd1632919c43db4bc738e2bc85ceea6dd30880dba27df9c3317531f1017624d4bd8979e6c5fad58112c7aa1189f0b844
MD5 SHA1 SHA512

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msconfig.exe

Path C:\Users\Admin\AppData\Roaming\msconfig\msconfig.exe
Size 9.0MB
SHA256 4b3430ba8a4388133716b3747f00e9a98c99f37631aac98a03ff6bc8b674cf1e
MD5 78c78748cab54dcf941633f5297c1bf6
SHA1 0c0ee5e0694315bc3813c95d8561056dd8831bee
SHA512 d2212b83a7a4ca4d428cb200f45cc723f6f41485ffd7856f6eeba00f86996f584009e3f2fc5bb0230bfaa96e9c75ac08d3a0c56a07fa94b03b5b220e3e63458f
SSDEEP 49152:/D34Eaz/gdH5o3T8VNZXPkp33BbXh4cpybjPimb+GbZ16xViBGGxxedCCaU0Ddd9:/EsHiAKJxDhpYqemxkDTfgY
MD5 SHA1 SHA512 SSDEEP

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Msconfig.exe

Path C:\Windows\SysWOW64\SubDir\Msconfig.exe
Size 2.5MB
SHA256 c16336ab32195b08c1678220fbe0256fee865f623e2b32fcfa4d9825fd68977e
MD5 0a7608db01cae07792cea95e792aa866
SHA1 71dff876e4d5edb6cea78fee7aa15845d4950e24
SHA512 990a6fa1b8adb6727b1dcd8931ad84fdcb556533b78f896a71eae2a7e3ae3222e4b8efaa4b629ced2841211750e0d8a75ddd546a983c2e586918dd8ba4e0dc42
SSDEEP 49152:S6F5PsH1IaspqACp//9NqqAJN77F29ZJOx2uc:jw16psLqqAJN77F29jOx27
MD5 SHA1 SHA512 SSDEEP

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memory/1804-14-0x0000000074DD0000-0x0000000075580000-memory.dmp

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memory/1804-1-0x0000000074DD0000-0x0000000075580000-memory.dmp

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memory/1804-2-0x00000000033E0000-0x00000000033F0000-memory.dmp

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memory/1804-3-0x0000000005ED0000-0x0000000006474000-memory.dmp

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memory/1804-4-0x0000000074DD0000-0x0000000075580000-memory.dmp

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memory/1804-0-0x0000000000CC0000-0x0000000000FEC000-memory.dmp

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memory/2532-9-0x0000000005070000-0x0000000005080000-memory.dmp

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memory/2532-13-0x0000000005100000-0x000000000510A000-memory.dmp

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memory/2532-21-0x0000000074DD0000-0x0000000075580000-memory.dmp

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memory/2532-8-0x0000000005120000-0x00000000051B2000-memory.dmp

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memory/2532-7-0x0000000000900000-0x0000000000C24000-memory.dmp

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memory/2532-6-0x0000000074DD0000-0x0000000075580000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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