quasar | 4b3430ba8a4388133716b3747f00e9a98c99f37631aac98a03ff6bc8b674cf1e

Analysis

max time kernel
141s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
01/05/2024, 09:42

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General

Target
Encrypted.exe
Size 9.0MB
Sample240501-lpdrsseb32
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/1976-7-0x0000000000A60000-0x0000000000D84000-memory.dmp	family_quasar

Executes dropped EXE 3 IoCs

pid	Process
1252	Msconfig.exe
4072	msconfig.exe
1592	Msconfig.exe

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Drops file in System32 directory 6 IoCs

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

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1596 set thread context of 1976	1596	Encrypted.exe	100
PID 4072 set thread context of 2304	4072	msconfig.exe	112

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
2696	schtasks.exe
3620	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1976	vbc.exe
Token: SeDebugPrivilege	2304	vbc.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 1596 wrote to memory of 1976	1596	Encrypted.exe	100
PID 1596 wrote to memory of 1976	1596	Encrypted.exe	100
PID 1596 wrote to memory of 1976	1596	Encrypted.exe	100
PID 1596 wrote to memory of 1976	1596	Encrypted.exe	100
PID 1596 wrote to memory of 1976	1596	Encrypted.exe	100
PID 1596 wrote to memory of 1976	1596	Encrypted.exe	100
PID 1596 wrote to memory of 1976	1596	Encrypted.exe	100
PID 1596 wrote to memory of 1976	1596	Encrypted.exe	100
PID 1596 wrote to memory of 3668	1596	Encrypted.exe	101
PID 1596 wrote to memory of 3668	1596	Encrypted.exe	101
PID 1596 wrote to memory of 3668	1596	Encrypted.exe	101
PID 1596 wrote to memory of 4532	1596	Encrypted.exe	103
PID 1596 wrote to memory of 4532	1596	Encrypted.exe	103
PID 1596 wrote to memory of 4532	1596	Encrypted.exe	103
PID 4532 wrote to memory of 2696	4532	cmd.exe	105
PID 4532 wrote to memory of 2696	4532	cmd.exe	105
PID 4532 wrote to memory of 2696	4532	cmd.exe	105
PID 1596 wrote to memory of 2072	1596	Encrypted.exe	106
PID 1596 wrote to memory of 2072	1596	Encrypted.exe	106
PID 1596 wrote to memory of 2072	1596	Encrypted.exe	106
PID 1976 wrote to memory of 1252	1976	vbc.exe	108
PID 1976 wrote to memory of 1252	1976	vbc.exe	108
PID 1976 wrote to memory of 1252	1976	vbc.exe	108
PID 4072 wrote to memory of 2304	4072	msconfig.exe	112
PID 4072 wrote to memory of 2304	4072	msconfig.exe	112
PID 4072 wrote to memory of 2304	4072	msconfig.exe	112
PID 4072 wrote to memory of 2304	4072	msconfig.exe	112
PID 4072 wrote to memory of 2304	4072	msconfig.exe	112
PID 4072 wrote to memory of 2304	4072	msconfig.exe	112
PID 4072 wrote to memory of 2304	4072	msconfig.exe	112
PID 4072 wrote to memory of 2304	4072	msconfig.exe	112
PID 4072 wrote to memory of 1752	4072	msconfig.exe	113
PID 4072 wrote to memory of 1752	4072	msconfig.exe	113
PID 4072 wrote to memory of 1752	4072	msconfig.exe	113
PID 4072 wrote to memory of 1660	4072	msconfig.exe	115
PID 4072 wrote to memory of 1660	4072	msconfig.exe	115
PID 4072 wrote to memory of 1660	4072	msconfig.exe	115
PID 1660 wrote to memory of 3620	1660	cmd.exe	117
PID 1660 wrote to memory of 3620	1660	cmd.exe	117
PID 1660 wrote to memory of 3620	1660	cmd.exe	117
PID 4072 wrote to memory of 2252	4072	msconfig.exe	118
PID 4072 wrote to memory of 2252	4072	msconfig.exe	118
PID 4072 wrote to memory of 2252	4072	msconfig.exe	118
PID 2304 wrote to memory of 1592	2304	vbc.exe	120
PID 2304 wrote to memory of 1592	2304	vbc.exe	120
PID 2304 wrote to memory of 1592	2304	vbc.exe	120

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:1596
- 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:1976
- - C:\Windows\SysWOW64\SubDir\Msconfig.exe
    "C:\Windows\system32\SubDir\Msconfig.exe"
    3⤵
    - Executes dropped EXE
    PID:1252
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C mkdir "C:\Users\Admin\AppData\Roaming\msconfig"
  2⤵
  PID:3668
- 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:4532
- - 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:2696
- 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:2072

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4068 --field-trial-handle=2236,i,5367110156796017614,12594004256180761011,262144 --variations-seed-version /prefetch:8
1⤵
PID:3672

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:4072
- 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:2304
- - C:\Windows\SysWOW64\SubDir\Msconfig.exe
    "C:\Windows\system32\SubDir\Msconfig.exe"
    3⤵
    - Executes dropped EXE
    PID:1592
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe" /C mkdir "C:\Users\Admin\AppData\Roaming\msconfig"
  2⤵
  PID:1752
- 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:1660
- - 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:3620
- 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:2252

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

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/1596-4-0x00000000744B0000-0x0000000074C60000-memory.dmp

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memory/1596-0-0x00000000744B0000-0x0000000074C60000-memory.dmp

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memory/1596-5-0x0000000005A30000-0x0000000005A40000-memory.dmp

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memory/1596-14-0x00000000744B0000-0x0000000074C60000-memory.dmp

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memory/1596-3-0x0000000005FF0000-0x0000000006594000-memory.dmp

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memory/1596-2-0x0000000005A30000-0x0000000005A40000-memory.dmp

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memory/1596-1-0x0000000000E10000-0x000000000113C000-memory.dmp

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memory/1976-7-0x0000000000A60000-0x0000000000D84000-memory.dmp

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memory/1976-8-0x00000000744B0000-0x0000000074C60000-memory.dmp

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memory/1976-9-0x00000000052F0000-0x0000000005382000-memory.dmp

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memory/1976-13-0x00000000053E0000-0x00000000053F0000-memory.dmp

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memory/1976-15-0x00000000052B0000-0x00000000052BA000-memory.dmp

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memory/1976-22-0x00000000744B0000-0x0000000074C60000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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