quasar | 7b652915c4539bf3c40a0700ca93c63e5fb1e56fdf0eb89567f7f0a8fb081aeb

Analysis

max time kernel
46s
max time network
48s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
15-12-2024 22:45

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General

Target

Client-built.exe
Size

3.1MB
MD5

85b177add44a49f07c6610191c064bbc
SHA1

7766290221b9dafd7c0d6d983070f55863ed1b26
SHA256

7b652915c4539bf3c40a0700ca93c63e5fb1e56fdf0eb89567f7f0a8fb081aeb
SHA512

0a4d7e6a5c3e2d63a92f2ae57ab68561f47e827edffea6ea83aebac8286aab886c3bd98c6e791222411d272a925e8b3e03e14dc1b1017aaa449c1b0674717798
SSDEEP

49152:TvChBYjCO4Dt2d5aKCuVPzlEmVQL0wvwkaUEGiBeHLoVd2THHB72eh2NT:Tv8t2d5aKCuVPzlEmVQ0wvwf/Gp

Score

10^/10

quasar ratted discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

ratted

localhost:4782

87.97.126.177:4782

Mutex

48887e39-00c3-4c7d-9fbd-aa9bee5b1a88

Attributes

encryption_key
CD36E224C70A801E8033FBB0E5129B1EA712AE1D
install_name
Windows Font Manager.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Font Manager
subdirectory
Fonts

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/440-1-0x0000000000CA0000-0x0000000000FC4000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b69-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3852	Windows Font Manager.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\Fonts\Windows Font Manager.exe	Client-built.exe
File opened for modification	C:\Windows\system32\Fonts\Windows Font Manager.exe	Client-built.exe
File opened for modification	C:\Windows\system32\Fonts	Client-built.exe
File opened for modification	C:\Windows\system32\Fonts\Windows Font Manager.exe	Windows Font Manager.exe
File opened for modification	C:\Windows\system32\Fonts	Windows Font Manager.exe

Browser Information Discovery 1 TTPs
Enumerate browser information.
discovery

Browser Information Discovery
T1217

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemManufacturer	msedge.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemProductName	msedge.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS	msedge.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
116	schtasks.exe
3500	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4716	msedge.exe
4716	msedge.exe
4020	msedge.exe
4020	msedge.exe

Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 2 IoCs

pid	Process
4020	msedge.exe
4020	msedge.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	440	Client-built.exe
Token: SeDebugPrivilege	3852	Windows Font Manager.exe
Token: SeDebugPrivilege	1956	Client-built.exe
Token: SeDebugPrivilege	3204	Client-built.exe

Suspicious use of FindShellTrayWindow 26 IoCs

pid	Process
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe

Suspicious use of SendNotifyMessage 24 IoCs

pid	Process
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe
4020	msedge.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 440 wrote to memory of 116	440	Client-built.exe	82
PID 440 wrote to memory of 116	440	Client-built.exe	82
PID 440 wrote to memory of 3852	440	Client-built.exe	84
PID 440 wrote to memory of 3852	440	Client-built.exe	84
PID 3852 wrote to memory of 3500	3852	Windows Font Manager.exe	85
PID 3852 wrote to memory of 3500	3852	Windows Font Manager.exe	85
PID 4020 wrote to memory of 3476	4020	msedge.exe	98
PID 4020 wrote to memory of 3476	4020	msedge.exe	98
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 2096	4020	msedge.exe	99
PID 4020 wrote to memory of 4716	4020	msedge.exe	100
PID 4020 wrote to memory of 4716	4020	msedge.exe	100
PID 4020 wrote to memory of 1196	4020	msedge.exe	101
PID 4020 wrote to memory of 1196	4020	msedge.exe	101
PID 4020 wrote to memory of 1196	4020	msedge.exe	101
PID 4020 wrote to memory of 1196	4020	msedge.exe	101
PID 4020 wrote to memory of 1196	4020	msedge.exe	101
PID 4020 wrote to memory of 1196	4020	msedge.exe	101
PID 4020 wrote to memory of 1196	4020	msedge.exe	101
PID 4020 wrote to memory of 1196	4020	msedge.exe	101
PID 4020 wrote to memory of 1196	4020	msedge.exe	101
PID 4020 wrote to memory of 1196	4020	msedge.exe	101
PID 4020 wrote to memory of 1196	4020	msedge.exe	101
PID 4020 wrote to memory of 1196	4020	msedge.exe	101
PID 4020 wrote to memory of 1196	4020	msedge.exe	101
PID 4020 wrote to memory of 1196	4020	msedge.exe	101

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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:440
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows Font Manager" /sc ONLOGON /tr "C:\Windows\system32\Fonts\Windows Font Manager.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:116
- C:\Windows\system32\Fonts\Windows Font Manager.exe
  "C:\Windows\system32\Fonts\Windows Font Manager.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3852
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Font Manager" /sc ONLOGON /tr "C:\Windows\system32\Fonts\Windows Font Manager.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3500

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --single-argument http://appdata/
1⤵
- Enumerates system info in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:4020
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=crashpad-handler "--user-data-dir=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data" /prefetch:7 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Crashpad" "--metrics-dir=C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data" --annotation=IsOfficialBuild=1 --annotation=channel= --annotation=chromium-version=92.0.4515.131 "--annotation=exe=C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --annotation=plat=Win64 "--annotation=prod=Microsoft Edge" --annotation=ver=92.0.902.67 --initial-client-data=0x120,0x124,0x128,0xf8,0x12c,0x7ffbf45546f8,0x7ffbf4554708,0x7ffbf4554718
  2⤵
  PID:3476
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=gpu-process --field-trial-handle=2076,12579228718676968147,11480468049342087633,131072 --gpu-preferences=UAAAAAAAAADgAAAQAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHgAAAAAAAAAeAAAAAAAAAAoAAAABAAAACAAAAAAAAAAKAAAAAAAAAAwAAAAAAAAADgAAAAAAAAAEAAAAAAAAAAAAAAADQAAABAAAAAAAAAAAQAAAA0AAAAQAAAAAAAAAAQAAAANAAAAEAAAAAAAAAAHAAAADQAAAAgAAAAAAAAACAAAAAAAAAA= --mojo-platform-channel-handle=2092 /prefetch:2
  2⤵
  PID:2096
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --field-trial-handle=2076,12579228718676968147,11480468049342087633,131072 --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=2196 /prefetch:3
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:4716
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=storage.mojom.StorageService --field-trial-handle=2076,12579228718676968147,11480468049342087633,131072 --lang=en-US --service-sandbox-type=utility --mojo-platform-channel-handle=2660 /prefetch:8
  2⤵
  PID:1196
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=2076,12579228718676968147,11480468049342087633,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=6 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=3344 /prefetch:1
  2⤵
  PID:1268
- C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
  "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --field-trial-handle=2076,12579228718676968147,11480468049342087633,131072 --lang=en-US --disable-client-side-phishing-detection --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --no-v8-untrusted-code-mitigations --mojo-platform-channel-handle=3372 /prefetch:1
  2⤵
  PID:4144

C:\Windows\System32\CompPkgSrv.exe
C:\Windows\System32\CompPkgSrv.exe -Embedding
1⤵
PID:1612

C:\Windows\System32\CompPkgSrv.exe
C:\Windows\System32\CompPkgSrv.exe -Embedding
1⤵
PID:704

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:1732

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1956

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3204

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Browser Information Discovery

T1217

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client-built.exe.log

Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Crashpad\settings.dat

Filesize
152B

MD5
e443ee4336fcf13c698b8ab5f3c173d0

SHA1
9bf70b16f03820cbe3158e1f1396b07b8ac9d75a

SHA256
79e277da2074f9467e0518f0f26ca2ba74914bee82553f935a0ccf64a0119e8b

SHA512
cbf6f6aa0ea69b47f51592296da2b7be1180e7b483c61b4d17ba9ee1a2d3345cbe0987b96f4e25de1438b553db358f330aad8a26e8522601f055c3d5a8313cdd

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Crashpad\settings.dat

Filesize
152B

MD5
56a4f78e21616a6e19da57228569489b

SHA1
21bfabbfc294d5f2aa1da825c5590d760483bc76

SHA256
d036661e765ee8fd18978a2b5501e8df6b220e4bca531d9860407555294c96fb

SHA512
c2c3cd1152bb486028fe75ab3ce0d0bc9d64c4ca7eb8860ddd934b2f6e0140d2c913af4fa082b88e92a6a6d20fd483a1cb9813209f371a0f56374bc97d7f863b

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Preferences

Filesize
5KB

MD5
6315d1da316f0ae2cfb3b576d0885a5d

SHA1
fd70e0adb9e4c32b6f74e93098ad730ebc811401

SHA256
af1714a0397b377a02b3ca32390a887dacf074be0692f1b230893f5ba7175d0f

SHA512
75ca3675ca051d4a7877acc8ed5df88834f0d905bb22c2e626d5ee967df2b19209bbe49c62a897d6f1603a3bd3fcc9c3a7c4072de0aac5f6d6430e3030e30beb

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Preferences

Filesize
6KB

MD5
7bd8f434e976b7ae2140ec5134faad7c

SHA1
fcf7eed11aa35bbdec456e2e5c35206d743ff624

SHA256
ab4dba104e676822cdae6ec4092bb24008bff90604fdbe9a09c70d6b37390996

SHA512
3d28d64772a48a9a996582fe7238201f1953f933224a71d90a9e45790e9a83970880e08663ce2396caba8f7330f174a1965219064e56c696d186657cba0510f5

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\ShaderCache\GPUCache\data_1

Filesize
264KB

MD5
f50f89a0a91564d0b8a211f8921aa7de

SHA1
112403a17dd69d5b9018b8cede023cb3b54eab7d

SHA256
b1e963d702392fb7224786e7d56d43973e9b9efd1b89c17814d7c558ffc0cdec

SHA512
bf8cda48cf1ec4e73f0dd1d4fa5562af1836120214edb74957430cd3e4a2783e801fa3f4ed2afb375257caeed4abe958265237d6e0aacf35a9ede7a2e8898d58

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\bba97338-15e1-47ab-b57b-d43c96302921.tmp

Filesize
10KB

MD5
bd1be275f8b69fe7c8fd24338c1a12fb

SHA1
68ee77f8fb14795469e859c57e0540d25d0e15fe

SHA256
057617fd774e30b37fb9a91b05204cec3072c466a236ebe98bf04380d9dde0d4

SHA512
21c06c3b20d34c0347fab99a4e294b32ae881ceb6c4097de685868983dadf6f6d693d6abe285826a77a2ce5b013e33d9601946904f205963bfb185787600a6c5

Download Submit
C:\Windows\System32\Fonts\Windows Font Manager.exe

Filesize
3.1MB

MD5
85b177add44a49f07c6610191c064bbc

SHA1
7766290221b9dafd7c0d6d983070f55863ed1b26

SHA256
7b652915c4539bf3c40a0700ca93c63e5fb1e56fdf0eb89567f7f0a8fb081aeb

SHA512
0a4d7e6a5c3e2d63a92f2ae57ab68561f47e827edffea6ea83aebac8286aab886c3bd98c6e791222411d272a925e8b3e03e14dc1b1017aaa449c1b0674717798

Download Submit
memory/440-9-0x00007FFBFB080000-0x00007FFBFBB41000-memory.dmp

Filesize
10.8MB

Download
memory/440-0-0x00007FFBFB083000-0x00007FFBFB085000-memory.dmp

Filesize
8KB

Download
memory/440-2-0x00007FFBFB080000-0x00007FFBFBB41000-memory.dmp

Filesize
10.8MB

Download
memory/440-1-0x0000000000CA0000-0x0000000000FC4000-memory.dmp

Filesize
3.1MB

Download
memory/3852-10-0x00007FFBFB080000-0x00007FFBFBB41000-memory.dmp

Filesize
10.8MB

Download
memory/3852-14-0x00007FFBFB080000-0x00007FFBFBB41000-memory.dmp

Filesize
10.8MB

Download
memory/3852-13-0x000000001BE00000-0x000000001BEB2000-memory.dmp

Filesize
712KB

Download
memory/3852-12-0x000000001B220000-0x000000001B270000-memory.dmp

Filesize
320KB

Download
memory/3852-11-0x00007FFBFB080000-0x00007FFBFBB41000-memory.dmp

Filesize
10.8MB

Download