quasar | hxxps://github[.]com/quasar/Quasar/releases/tag/v1[.]4[.]1

General

Target

https://github.com/quasar/Quasar/releases/tag/v1.4.1

Score

10^/10

quasar spyware trojan

Malware Config

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2724-1-0x0000023491160000-0x0000023491298000-memory.dmp	family_quasar
behavioral1/memory/2724-2-0x00000234916B0000-0x00000234916C6000-memory.dmp	family_quasar

Modifies Internet Explorer settings 1 TTPs 4 IoCs

adware spyware

Modify Registry

T1112

Processes:

explorer.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\Software\Microsoft\Internet Explorer\Toolbar	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\SOFTWARE\Microsoft\Internet Explorer\Toolbar\Locked = "1"	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\SOFTWARE\Microsoft\Internet Explorer\Toolbar\ShellBrowser	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\SOFTWARE\Microsoft\Internet Explorer\Toolbar\ShellBrowser\ITBar7Layout = 13000000000000000000000020000000100000000000000001000000010700005e01000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	explorer.exe

Modifies registry class 30 IoCs

Processes:

explorer.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{4336a54d-038b-4685-ab02-99bb52d3fb8b}\Instance\	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots = 02020202	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1\0\0	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\4	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1 = 19002f433a5c000000000000000000000000000000000000000000	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1\0 = 7800310000000000a85827611100557365727300640009000400efbe874f7748c1589b5e2e000000c70500000000010000000000000000003a0000000000eff5be0055007300650072007300000040007300680065006c006c00330032002e0064006c006c002c002d0032003100380031003300000014000000	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1\0\0\0	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\MRUListEx = 0100000000000000ffffffff	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1\0\0\0 = 7e00310000000000c158aa5e11004465736b746f7000680009000400efbea8582761c158aa5e2e00000082e101000000010000000000000000003e00000000007413de004400650073006b0074006f007000000040007300680065006c006c00330032002e0064006c006c002c002d0032003100370036003900000016000000	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1\0	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1\0\MRUListEx = 00000000ffffffff	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1\0\0\0\0 = 6600310000000000c158b35e10005155415341527e312e3100004c0009000400efbec158aa5ec158b35e2e00000068340200000009000000000000000000000000000000cd68e0005100750061007300610072002000760031002e0034002e00310000001a000000	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1\0\0\0\MRUListEx = 00000000ffffffff	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\4\Shell	explorer.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\4\Shell\SniffedFolderType = "Generic"	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots = 020202	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1\MRUListEx = 00000000ffffffff	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1\0\0\MRUListEx = 00000000ffffffff	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1\0\0\0\0	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1\0\0\0\0\NodeSlot = "4"	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = 0000000001000000ffffffff	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1\0\0 = 5000310000000000a8584268100041646d696e003c0009000400efbea8582761c1589b5e2e00000078e10100000001000000000000000000000000000000248f1d01410064006d0069006e00000014000000	explorer.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\1\0\0\0\0\MRUListEx = ffffffff	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0	explorer.exe
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell	explorer.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

explorer.exe

pid process

5604 explorer.exe
Suspicious behavior: GetForegroundWindowSpam 2 IoCs

Processes:

explorer.exeQuasar.exe

pid process

5604 explorer.exe
2724 Quasar.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Quasar.exe

description pid process

Token: SeDebugPrivilege 2724 Quasar.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Quasar.exe

pid process

2724 Quasar.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Quasar.exe

pid process

2724 Quasar.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

explorer.exe

pid process

5604 explorer.exe
5604 explorer.exe

pid	process
5604	explorer.exe

pid	process
5604	explorer.exe
2724	Quasar.exe

description	pid	process
Token: SeDebugPrivilege	2724	Quasar.exe

pid	process
2724	Quasar.exe

pid	process
2724	Quasar.exe

pid	process
5604	explorer.exe
5604	explorer.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

Quasar.exeexplorer.exe

description	pid	process	target process
PID 2724 wrote to memory of 5492	2724	Quasar.exe	explorer.exe
PID 2724 wrote to memory of 5492	2724	Quasar.exe	explorer.exe
PID 5604 wrote to memory of 5732	5604	explorer.exe	rundll32.exe
PID 5604 wrote to memory of 5732	5604	explorer.exe	rundll32.exe

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --single-argument https://github.com/quasar/Quasar/releases/tag/v1.4.1
1⤵
PID:1916

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --enable-dinosaur-easter-egg-alt-images --no-appcompat-clear --lang=en-US --js-flags=--ms-user-locale= --device-scale-factor=1 --num-raster-threads=1 --renderer-client-id=16 --field-trial-handle=3772,i,13544508926340531097,6671217806016090640,262144 --variations-seed-version --mojo-platform-channel-handle=4004 /prefetch:1
1⤵
PID:3108

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --enable-dinosaur-easter-egg-alt-images --no-appcompat-clear --lang=en-US --js-flags=--ms-user-locale= --device-scale-factor=1 --num-raster-threads=1 --renderer-client-id=15 --field-trial-handle=4252,i,13544508926340531097,6671217806016090640,262144 --variations-seed-version --mojo-platform-channel-handle=5068 /prefetch:1
1⤵
PID:1508

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --enable-dinosaur-easter-egg-alt-images --no-appcompat-clear --lang=en-US --js-flags=--ms-user-locale= --device-scale-factor=1 --num-raster-threads=1 --renderer-client-id=17 --field-trial-handle=4732,i,13544508926340531097,6671217806016090640,262144 --variations-seed-version --mojo-platform-channel-handle=5196 /prefetch:1
1⤵
PID:2576

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 --field-trial-handle=4016,i,13544508926340531097,6671217806016090640,262144 --variations-seed-version --mojo-platform-channel-handle=5336 /prefetch:8
1⤵
PID:5032

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=entity_extraction_service.mojom.Extractor --lang=en-US --service-sandbox-type=entity_extraction --onnx-enabled-for-ee --no-appcompat-clear --field-trial-handle=5456,i,13544508926340531097,6671217806016090640,262144 --variations-seed-version --mojo-platform-channel-handle=5516 /prefetch:8
1⤵
PID:2672

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=data_decoder.mojom.DataDecoderService --lang=en-US --service-sandbox-type=service --no-appcompat-clear --field-trial-handle=5928,i,13544508926340531097,6671217806016090640,262144 --variations-seed-version --mojo-platform-channel-handle=5896 /prefetch:8
1⤵
PID:3240

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --enable-dinosaur-easter-egg-alt-images --no-appcompat-clear --disable-gpu-compositing --lang=en-US --js-flags=--ms-user-locale= --device-scale-factor=1 --num-raster-threads=1 --renderer-client-id=21 --field-trial-handle=5736,i,13544508926340531097,6671217806016090640,262144 --variations-seed-version --mojo-platform-channel-handle=6136 /prefetch:1
1⤵
PID:3188

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=edge_collections.mojom.CollectionsDataManager --lang=en-US --service-sandbox-type=collections --no-appcompat-clear --field-trial-handle=6024,i,13544508926340531097,6671217806016090640,262144 --variations-seed-version --mojo-platform-channel-handle=5992 /prefetch:8
1⤵
PID:3860

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=renderer --enable-dinosaur-easter-egg-alt-images --no-appcompat-clear --disable-gpu-compositing --lang=en-US --js-flags=--ms-user-locale= --device-scale-factor=1 --num-raster-threads=1 --renderer-client-id=23 --field-trial-handle=5640,i,13544508926340531097,6671217806016090640,262144 --variations-seed-version --mojo-platform-channel-handle=6080 /prefetch:1
1⤵
PID:2796

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=chrome.mojom.FileUtilService --lang=en-US --service-sandbox-type=service --no-appcompat-clear --field-trial-handle=5776,i,13544508926340531097,6671217806016090640,262144 --variations-seed-version --mojo-platform-channel-handle=6072 /prefetch:8
1⤵
PID:1000

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=quarantine.mojom.Quarantine --lang=en-US --service-sandbox-type=none --no-appcompat-clear --field-trial-handle=6716,i,13544508926340531097,6671217806016090640,262144 --variations-seed-version --mojo-platform-channel-handle=6640 /prefetch:8
1⤵
PID:3480

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:4996

C:\Users\Admin\Desktop\Quasar v1.4.1\Quasar.exe
"C:\Users\Admin\Desktop\Quasar v1.4.1\Quasar.exe"
1⤵
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:2724

C:\Windows\explorer.exe
"C:\Windows\explorer.exe" /select, "C:\Users\Admin\Desktop\Quasar v1.4.1\quasar.p12"
2⤵
PID:5492

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=edge_search_indexer.mojom.SearchIndexerInterfaceBroker --lang=en-US --service-sandbox-type=search_indexer --message-loop-type-ui --no-appcompat-clear --field-trial-handle=6984,i,13544508926340531097,6671217806016090640,262144 --variations-seed-version --mojo-platform-channel-handle=6540 /prefetch:8
1⤵
PID:5432

C:\Windows\explorer.exe
C:\Windows\explorer.exe /factory,{75dff2b7-6936-4c06-a8bb-676a7b00b24b} -Embedding
1⤵
- Modifies Internet Explorer settings
- Modifies registry class
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5604

C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" cryptext.dll,CryptExtAddPFX C:\Users\Admin\Desktop\Quasar v1.4.1\quasar.p12
2⤵
PID:5732

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\Desktop\Quasar v1.4.1\quasar.p12

Filesize
4KB

MD5
98c6bfe4ac228d04804766ee01a28230

SHA1
178d319d76bcf6670199419ac9fdc5f262e275f6

SHA256
d7acc3b656a892159331c50c22879f771679c22537f20e33490ae175fe1b280e

SHA512
dbd4f9e5330751d70e063fbc9b42f3478b6bf34ded75cc3cdd9f2938ff237d4ad8ae13521a94e12d9a31d559ff9cb938e2aa10cdfb938dc075c4b5c291005310

Download Submit
memory/2724-30-0x00000234ADBC0000-0x00000234ADBD8000-memory.dmp

Filesize
96KB

Download
memory/2724-2-0x00000234916B0000-0x00000234916C6000-memory.dmp

Filesize
88KB

Download
memory/2724-3-0x00007FFFA8E30000-0x00007FFFA98F1000-memory.dmp

Filesize
10.8MB

Download
memory/2724-4-0x00007FFFA8E30000-0x00007FFFA98F1000-memory.dmp

Filesize
10.8MB

Download
memory/2724-5-0x00000234AEA00000-0x00000234AED2E000-memory.dmp

Filesize
3.2MB

Download
memory/2724-0-0x00007FFFA8E33000-0x00007FFFA8E35000-memory.dmp

Filesize
8KB

Download
memory/2724-1-0x0000023491160000-0x0000023491298000-memory.dmp

Filesize
1.2MB

Download
memory/2724-31-0x00000234ADE40000-0x00000234ADE90000-memory.dmp

Filesize
320KB

Download
memory/2724-34-0x00000234AE6E0000-0x00000234AE72C000-memory.dmp

Filesize
304KB

Download
memory/2724-33-0x00007FFFA8E33000-0x00007FFFA8E35000-memory.dmp

Filesize
8KB

Download
memory/2724-32-0x00000234AE7A0000-0x00000234AE852000-memory.dmp

Filesize
712KB

Download
memory/2724-35-0x00007FFFA8E30000-0x00007FFFA98F1000-memory.dmp

Filesize
10.8MB

Download
memory/2724-36-0x00007FFFA8E30000-0x00007FFFA98F1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads