ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
04/12/2022, 08:06

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General

Target

ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe
Size

168KB
MD5

1a3accafb3d975d55a6844be4bbfa634
SHA1

c406d6f0a52a7876bced084da5e6b11c0addaef7
SHA256

ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3
SHA512

313af44e2156f514029e1e802e694c115907ad3a0168836b8817dfa3f58cbe28e3637af4fb76670258a67d051bc2743f22390aac80cbe9084a7d616a1e484920
SSDEEP

3072:ByMI7V0SizShu3ARD9ikLhj0wQ7HXy79g3pD/Y3dmhQPS1GqSl:te0Sizuu3ARD9VLJTgC79QzqC9Sl

Score

8^/10

persistence

Malware Config

Signatures

Executes dropped EXE 3 IoCs

pid	Process
1548	Kirrrb.exe
2536	Kirrrb.exe
476	Kirrrb.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Windows\CurrentVersion\Run	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Kirrrb = "C:\\Users\\Admin\\AppData\\Roaming\\Kirrrb.exe"	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 3300 set thread context of 3036	3300	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	78
PID 3036 set thread context of 1512	3036	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	79
PID 1548 set thread context of 2536	1548	Kirrrb.exe	85
PID 2536 set thread context of 476	2536	Kirrrb.exe	86

Modifies Internet Explorer settings 1 TTPs 28 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\VersionManager	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastUpdateLowDateTime = "1557536568"	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastTTLHighDateTime = "50"	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion\FileNames	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateLowDateTime = "1600661661"	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\Main\CompatibilityFlags = "0"	IEXPLORE.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\Main\Window_Placement = 2c0000000200000003000000ffffffffffffffffffffffffffffffff2400000024000000aa04000089020000	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastTTLLowDateTime = "1251635200"	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\VersionManager	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateHighDateTime = "31001225"	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch	IEXPLORE.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running"	IEXPLORE.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\Main\FullScreen = "no"	IEXPLORE.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion\FileNames\en-US = "en-US.1"	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\Main	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateLowDateTime = "1557536568"	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateHighDateTime = "31001225"	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion\FileNames\	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\DomainSuggestion	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\FileNames\	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\Main	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\Recovery\AdminActive\{86AEBDEB-767C-11ED-AECB-FA09CB65A760} = "0"	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "0"	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion\NextUpdateDate = "377216253"	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastUpdateHighDateTime = "31001225"	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion	IEXPLORE.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1512	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe
1512	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1096	IEXPLORE.EXE

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	476	Kirrrb.exe
Token: SeDebugPrivilege	4936	iexplore.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1096	IEXPLORE.EXE

Suspicious use of SetWindowsHookEx 8 IoCs

pid	Process
3300	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe
1548	Kirrrb.exe
1096	IEXPLORE.EXE
1096	IEXPLORE.EXE
2896	IEXPLORE.EXE
2896	IEXPLORE.EXE
2896	IEXPLORE.EXE
2896	IEXPLORE.EXE

Suspicious use of WriteProcessMemory 43 IoCs

description	pid	Process	procid_target
PID 3300 wrote to memory of 3036	3300	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	78
PID 3300 wrote to memory of 3036	3300	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	78
PID 3300 wrote to memory of 3036	3300	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	78
PID 3300 wrote to memory of 3036	3300	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	78
PID 3300 wrote to memory of 3036	3300	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	78
PID 3300 wrote to memory of 3036	3300	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	78
PID 3300 wrote to memory of 3036	3300	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	78
PID 3036 wrote to memory of 1512	3036	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	79
PID 3036 wrote to memory of 1512	3036	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	79
PID 3036 wrote to memory of 1512	3036	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	79
PID 3036 wrote to memory of 1512	3036	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	79
PID 3036 wrote to memory of 1512	3036	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	79
PID 3036 wrote to memory of 1512	3036	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	79
PID 3036 wrote to memory of 1512	3036	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	79
PID 3036 wrote to memory of 1512	3036	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	79
PID 1512 wrote to memory of 1548	1512	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	84
PID 1512 wrote to memory of 1548	1512	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	84
PID 1512 wrote to memory of 1548	1512	ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe	84
PID 1548 wrote to memory of 2536	1548	Kirrrb.exe	85
PID 1548 wrote to memory of 2536	1548	Kirrrb.exe	85
PID 1548 wrote to memory of 2536	1548	Kirrrb.exe	85
PID 1548 wrote to memory of 2536	1548	Kirrrb.exe	85
PID 1548 wrote to memory of 2536	1548	Kirrrb.exe	85
PID 1548 wrote to memory of 2536	1548	Kirrrb.exe	85
PID 1548 wrote to memory of 2536	1548	Kirrrb.exe	85
PID 2536 wrote to memory of 476	2536	Kirrrb.exe	86
PID 2536 wrote to memory of 476	2536	Kirrrb.exe	86
PID 2536 wrote to memory of 476	2536	Kirrrb.exe	86
PID 2536 wrote to memory of 476	2536	Kirrrb.exe	86
PID 2536 wrote to memory of 476	2536	Kirrrb.exe	86
PID 2536 wrote to memory of 476	2536	Kirrrb.exe	86
PID 2536 wrote to memory of 476	2536	Kirrrb.exe	86
PID 2536 wrote to memory of 476	2536	Kirrrb.exe	86
PID 476 wrote to memory of 4936	476	Kirrrb.exe	90
PID 476 wrote to memory of 4936	476	Kirrrb.exe	90
PID 476 wrote to memory of 4936	476	Kirrrb.exe	90
PID 4936 wrote to memory of 1096	4936	iexplore.exe	91
PID 4936 wrote to memory of 1096	4936	iexplore.exe	91
PID 476 wrote to memory of 4936	476	Kirrrb.exe	90
PID 476 wrote to memory of 4936	476	Kirrrb.exe	90
PID 1096 wrote to memory of 2896	1096	IEXPLORE.EXE	92
PID 1096 wrote to memory of 2896	1096	IEXPLORE.EXE	92
PID 1096 wrote to memory of 2896	1096	IEXPLORE.EXE	92

C:\Users\Admin\AppData\Local\Temp\ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe
"C:\Users\Admin\AppData\Local\Temp\ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3300
- C:\Users\Admin\AppData\Local\Temp\ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe
  C:\Users\Admin\AppData\Local\Temp\ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:3036
- - C:\Users\Admin\AppData\Local\Temp\ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe
    "C:\Users\Admin\AppData\Local\Temp\ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3.exe"
    3⤵
    - Adds Run key to start application
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:1512
  - - C:\Users\Admin\AppData\Roaming\Kirrrb.exe
      "C:\Users\Admin\AppData\Roaming\Kirrrb.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:1548
    - - C:\Users\Admin\AppData\Roaming\Kirrrb.exe
        
        C:\Users\Admin\AppData\Roaming\Kirrrb.exe
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:2536
      - C:\Users\Admin\AppData\Roaming\Kirrrb.exe
        
        "C:\Users\Admin\AppData\Roaming\Kirrrb.exe"
        6⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:476
        
        C:\Program Files (x86)\Internet Explorer\iexplore.exe
        
        "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
        7⤵
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:4936
        
        C:\Program Files\Internet Explorer\IEXPLORE.EXE
        
        "C:\Program Files\Internet Explorer\IEXPLORE.EXE"
        8⤵
        Modifies Internet Explorer settings
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of FindShellTrayWindow
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:1096
        
        C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
        
        "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:1096 CREDAT:17410 /prefetch:2
        9⤵
        Modifies Internet Explorer settings
        Suspicious use of SetWindowsHookEx
        
        PID:2896

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\7423F88C7F265F0DEFC08EA88C3BDE45_AA1E8580D4EBC816148CE81268683776

Filesize
471B

MD5
a62e66dbd157955d60808bf89987bcde

SHA1
a97e8478902ac7db7fd904300304944a41afee8e

SHA256
d34e72ae586b00a60e3526f1e75677dcffa83fd33860a771ae592e7d8320cf25

SHA512
2c969c621bd5881acf47e85b3a2977b1c43dfa80887f0ab447327162d143795ff647b8ed1aec174a868c0faf1e09eb8baa6a67ea42764b65fe4416d2168e81fc

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\7423F88C7F265F0DEFC08EA88C3BDE45_AA1E8580D4EBC816148CE81268683776

Filesize
434B

MD5
cbb9d848e4ef1cab5a2e52bb00cf4c47

SHA1
0d08cd29106a973ae3e08fb6a08b0d5d8b6056e8

SHA256
828174618a207d6005b978ca3a78e62be458023da86ee5a2be9f898011a53d7b

SHA512
c25ab6899be3d6e8881cd81444a392c2f9508aefd348f9d08f5b2a66eca46cd578d3882aad7e65e8ff1932be6fbb156bc2d871af4939d1c3b90ef2250a0fbd11

Download Submit
C:\Users\Admin\AppData\Roaming\Kirrrb.exe

Filesize
168KB

MD5
1a3accafb3d975d55a6844be4bbfa634

SHA1
c406d6f0a52a7876bced084da5e6b11c0addaef7

SHA256
ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3

SHA512
313af44e2156f514029e1e802e694c115907ad3a0168836b8817dfa3f58cbe28e3637af4fb76670258a67d051bc2743f22390aac80cbe9084a7d616a1e484920

Download Submit
C:\Users\Admin\AppData\Roaming\Kirrrb.exe

Filesize
168KB

MD5
1a3accafb3d975d55a6844be4bbfa634

SHA1
c406d6f0a52a7876bced084da5e6b11c0addaef7

SHA256
ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3

SHA512
313af44e2156f514029e1e802e694c115907ad3a0168836b8817dfa3f58cbe28e3637af4fb76670258a67d051bc2743f22390aac80cbe9084a7d616a1e484920

Download Submit
C:\Users\Admin\AppData\Roaming\Kirrrb.exe

Filesize
168KB

MD5
1a3accafb3d975d55a6844be4bbfa634

SHA1
c406d6f0a52a7876bced084da5e6b11c0addaef7

SHA256
ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3

SHA512
313af44e2156f514029e1e802e694c115907ad3a0168836b8817dfa3f58cbe28e3637af4fb76670258a67d051bc2743f22390aac80cbe9084a7d616a1e484920

Download Submit
C:\Users\Admin\AppData\Roaming\Kirrrb.exe

Filesize
168KB

MD5
1a3accafb3d975d55a6844be4bbfa634

SHA1
c406d6f0a52a7876bced084da5e6b11c0addaef7

SHA256
ac48861c4b673a71ad5a111d3b0d90a4ce2b78b8d2024440e9b89527d27c6ea3

SHA512
313af44e2156f514029e1e802e694c115907ad3a0168836b8817dfa3f58cbe28e3637af4fb76670258a67d051bc2743f22390aac80cbe9084a7d616a1e484920

Download Submit
memory/476-164-0x0000000000400000-0x000000000042A000-memory.dmp

Filesize
168KB

Download
memory/476-163-0x0000000000400000-0x000000000042A000-memory.dmp

Filesize
168KB

Download
memory/1512-144-0x0000000000400000-0x000000000042A000-memory.dmp

Filesize
168KB

Download
memory/1512-143-0x0000000000400000-0x000000000042A000-memory.dmp

Filesize
168KB

Download
memory/1512-161-0x0000000000400000-0x000000000042A000-memory.dmp

Filesize
168KB

Download
memory/1512-139-0x0000000000400000-0x000000000042A000-memory.dmp

Filesize
168KB

Download
memory/1548-148-0x0000000000400000-0x000000000043E000-memory.dmp

Filesize
248KB

Download
memory/1548-155-0x0000000000400000-0x000000000043E000-memory.dmp

Filesize
248KB

Download
memory/2536-159-0x0000000000400000-0x000000000041A000-memory.dmp

Filesize
104KB

Download
memory/3036-140-0x0000000000400000-0x000000000041A000-memory.dmp

Filesize
104KB

Download
memory/3036-136-0x0000000000400000-0x000000000041A000-memory.dmp

Filesize
104KB

Download
memory/3300-132-0x0000000000400000-0x000000000043E000-memory.dmp

Filesize
248KB

Download
memory/3300-142-0x0000000000400000-0x000000000043E000-memory.dmp

Filesize
248KB

Download