r77 | a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb

Analysis

max time kernel
150s
max time network
121s
platform
windows7_x64
resource
win7-20240220-en
resource tags

arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
submitted
06-03-2024 22:27

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General

Target

a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
Size

1.2MB
MD5

da0bcec014e398e3faba845bd73cfbda
SHA1

af957f165473b0ad284f0ecaa22aceada86c981d
SHA256

a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb
SHA512

f315030eed014bc206b44c5854d66b8cf4f13679308d4a7260fa36291634290dc363be644d3f93aef89e558e078db15aa502a181487ad4470ffb61b9325cecb1
SSDEEP

24576:PFOa+uxkXWtPcZztujn7z3LG5KuRgPKvbJ7QDS9+uot:tNkXWNcRtuz7GI3yvV79a

Score

10^/10

r77 evasion persistence rootkit

Malware Config

Signatures

Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2721934792-624042501-2768869379-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	svchost.exe

r77
r77 is an open-source, userland rootkit.
rootkit r77

r77 rootkit payload 1 IoCs

Detects the payload of the r77 rootkit.

resource	yara_rule
behavioral1/files/0x0038000000013adc-6.dat	r77_payload

Executes dropped EXE 6 IoCs

pid	Process
2296	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2552	icsys.icn.exe
2672	explorer.exe
2564	spoolsv.exe
2720	svchost.exe
2596	spoolsv.exe

Loads dropped DLL 12 IoCs

pid	Process
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2552	icsys.icn.exe
2672	explorer.exe
2564	spoolsv.exe
2720	svchost.exe
1208	Process not Found
2008	WerFault.exe
2008	WerFault.exe
2008	WerFault.exe
2008	WerFault.exe
2008	WerFault.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\resources\\themes\\explorer.exe RO"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\resources\\svchost.exe RO"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\resources\\themes\\explorer.exe RO"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\resources\\svchost.exe RO"	svchost.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\explorer.exe	explorer.exe
File opened for modification	C:\Windows\SysWOW64\explorer.exe	svchost.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File opened for modification	\??\c:\windows\resources\themes\explorer.exe	icsys.icn.exe
File opened for modification	\??\c:\windows\resources\spoolsv.exe	explorer.exe
File opened for modification	\??\c:\windows\resources\svchost.exe	spoolsv.exe
File opened for modification	C:\Windows\Resources\tjud.exe	explorer.exe
File opened for modification	C:\Windows\Resources\Themes\icsys.icn.exe	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe

Creates scheduled task(s) 1 TTPs 3 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2972	schtasks.exe
2128	schtasks.exe
1148	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2672	explorer.exe
2672	explorer.exe
2672	explorer.exe
2672	explorer.exe
2672	explorer.exe
2672	explorer.exe
2672	explorer.exe
2672	explorer.exe
2672	explorer.exe
2672	explorer.exe
2672	explorer.exe
2672	explorer.exe
2672	explorer.exe
2672	explorer.exe
2672	explorer.exe
2672	explorer.exe
2720	svchost.exe
2720	svchost.exe
2720	svchost.exe
2720	svchost.exe
2720	svchost.exe
2720	svchost.exe
2720	svchost.exe
2720	svchost.exe
2720	svchost.exe
2720	svchost.exe
2720	svchost.exe
2720	svchost.exe
2720	svchost.exe
2720	svchost.exe
2720	svchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
2672	explorer.exe
2720	svchost.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2296	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
2552	icsys.icn.exe
2552	icsys.icn.exe
2672	explorer.exe
2672	explorer.exe
2564	spoolsv.exe
2564	spoolsv.exe
2720	svchost.exe
2720	svchost.exe
2596	spoolsv.exe
2596	spoolsv.exe

Suspicious use of WriteProcessMemory 43 IoCs

description	pid	Process	procid_target
PID 2276 wrote to memory of 2296	2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	28
PID 2276 wrote to memory of 2296	2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	28
PID 2276 wrote to memory of 2296	2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	28
PID 2276 wrote to memory of 2296	2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	28
PID 2276 wrote to memory of 2552	2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	29
PID 2276 wrote to memory of 2552	2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	29
PID 2276 wrote to memory of 2552	2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	29
PID 2276 wrote to memory of 2552	2276	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	29
PID 2552 wrote to memory of 2672	2552	icsys.icn.exe	30
PID 2552 wrote to memory of 2672	2552	icsys.icn.exe	30
PID 2552 wrote to memory of 2672	2552	icsys.icn.exe	30
PID 2552 wrote to memory of 2672	2552	icsys.icn.exe	30
PID 2672 wrote to memory of 2564	2672	explorer.exe	31
PID 2672 wrote to memory of 2564	2672	explorer.exe	31
PID 2672 wrote to memory of 2564	2672	explorer.exe	31
PID 2672 wrote to memory of 2564	2672	explorer.exe	31
PID 2564 wrote to memory of 2720	2564	spoolsv.exe	32
PID 2564 wrote to memory of 2720	2564	spoolsv.exe	32
PID 2564 wrote to memory of 2720	2564	spoolsv.exe	32
PID 2564 wrote to memory of 2720	2564	spoolsv.exe	32
PID 2720 wrote to memory of 2596	2720	svchost.exe	33
PID 2720 wrote to memory of 2596	2720	svchost.exe	33
PID 2720 wrote to memory of 2596	2720	svchost.exe	33
PID 2720 wrote to memory of 2596	2720	svchost.exe	33
PID 2672 wrote to memory of 2464	2672	explorer.exe	34
PID 2672 wrote to memory of 2464	2672	explorer.exe	34
PID 2672 wrote to memory of 2464	2672	explorer.exe	34
PID 2672 wrote to memory of 2464	2672	explorer.exe	34
PID 2720 wrote to memory of 2972	2720	svchost.exe	35
PID 2720 wrote to memory of 2972	2720	svchost.exe	35
PID 2720 wrote to memory of 2972	2720	svchost.exe	35
PID 2720 wrote to memory of 2972	2720	svchost.exe	35
PID 2296 wrote to memory of 2008	2296	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	38
PID 2296 wrote to memory of 2008	2296	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	38
PID 2296 wrote to memory of 2008	2296	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	38
PID 2720 wrote to memory of 2128	2720	svchost.exe	41
PID 2720 wrote to memory of 2128	2720	svchost.exe	41
PID 2720 wrote to memory of 2128	2720	svchost.exe	41
PID 2720 wrote to memory of 2128	2720	svchost.exe	41
PID 2720 wrote to memory of 1148	2720	svchost.exe	43
PID 2720 wrote to memory of 1148	2720	svchost.exe	43
PID 2720 wrote to memory of 1148	2720	svchost.exe	43
PID 2720 wrote to memory of 1148	2720	svchost.exe	43

C:\Users\Admin\AppData\Local\Temp\a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
"C:\Users\Admin\AppData\Local\Temp\a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe"
1⤵
- Loads dropped DLL
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2276
- \??\c:\users\admin\appdata\local\temp\a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
  c:\users\admin\appdata\local\temp\a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2296
- - C:\Windows\system32\WerFault.exe
    C:\Windows\system32\WerFault.exe -u -p 2296 -s 756
    3⤵
    - Loads dropped DLL
    PID:2008
- C:\Windows\Resources\Themes\icsys.icn.exe
  C:\Windows\Resources\Themes\icsys.icn.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Windows directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2552
- - \??\c:\windows\resources\themes\explorer.exe
    c:\windows\resources\themes\explorer.exe
    3⤵
    - Modifies visiblity of hidden/system files in Explorer
    - Executes dropped EXE
    - Loads dropped DLL
    - Adds Run key to start application
    - Drops file in System32 directory
    - Drops file in Windows directory
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2672
  - - \??\c:\windows\resources\spoolsv.exe
      c:\windows\resources\spoolsv.exe SE
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Drops file in Windows directory
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:2564
    - - \??\c:\windows\resources\svchost.exe
        
        c:\windows\resources\svchost.exe
        5⤵
        Modifies visiblity of hidden/system files in Explorer
        Executes dropped EXE
        Loads dropped DLL
        Adds Run key to start application
        Drops file in System32 directory
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:2720
      - \??\c:\windows\resources\spoolsv.exe
        
        c:\windows\resources\spoolsv.exe PR
        6⤵
        Executes dropped EXE
        Suspicious use of SetWindowsHookEx
        
        PID:2596
      - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /create /tn "svchost" /tr "c:\windows\resources\svchost.exe" /sc daily /st 22:29 /f
        6⤵
        Creates scheduled task(s)
        
        PID:2972
      - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /create /tn "svchost" /tr "c:\windows\resources\svchost.exe" /sc daily /st 22:30 /f
        6⤵
        Creates scheduled task(s)
        
        PID:2128
      - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /create /tn "svchost" /tr "c:\windows\resources\svchost.exe" /sc daily /st 22:31 /f
        6⤵
        Creates scheduled task(s)
        
        PID:1148
  - - C:\Windows\Explorer.exe
      C:\Windows\Explorer.exe
      4⤵
      PID:2464

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\Resources\Themes\explorer.exe

Filesize
135KB

MD5
9d12cd066c8d5709f7d57e432b846371

SHA1
300d9f3ec61c259d2000b7de4cff4bf41b781dd1

SHA256
59c80b569926878e8deccfe5a683e85555cb6e577efc8964830656f9a3912b02

SHA512
f1148b9e78f3f058107121139af88f1f763f83e84103a8b76b366c564f0eb8a205af0f11360bfbcf13423b3414d5b6617b53990b4599a768fc5b03d7099aac39

Download Submit
\Users\Admin\AppData\Local\Temp\a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe

Filesize
1.1MB

MD5
cc63fa843ab94603b970a6e653f4f13b

SHA1
6fd8e1fc257153926c2e499b0663b3cdbebd5b34

SHA256
6d64edfae65a6cd656ef6cdb9e1a477de984f224e72ae3b3e6fdee9b33ed7f71

SHA512
ba2d92beee1a74bffd45ef8b56eed59da79d61ec9ebee01bbc2c35986be7569d9ed78ac3063c5e5f67a64b7eb96ac87f939757e7a20c22bf0b194b2aefc2db8b

Download Submit
\Windows\Resources\Themes\icsys.icn.exe

Filesize
135KB

MD5
db9cbf2cb097b6e0cf12ee854a6ecde5

SHA1
5021461b8b376c7ddb8a066685499cb4198e0537

SHA256
2c58393f8551bba71f450bffab74aa7fc8f4d90dc01dbd0560aaf9d00f3b4977

SHA512
a934ea569b8a8742400c21830d1c65ac667b10a9adcb69851116792a8bbe693e09996db0b5d95e798349782486da2620fe3a7618d476c3910c5877daed60abc8

Download Submit
\Windows\Resources\spoolsv.exe

Filesize
135KB

MD5
1c0dc6b023c7c1e7234226de75b93687

SHA1
ff4ed9d401382900d7d8ebe16442a71063e53a39

SHA256
4f380113b42ea1ec97dbf19e2cc9950b0864a0f3a46a4d5dac148efef52a3ee1

SHA512
78e8fe40b1b9917ee73635e6ebee5f02635be9226b15c395b8de4659f28f82ecd66b59bfa89a6fc836be4d90c7a998a330e7278e9b734a651f9030d7fc6e867c

Download Submit
\Windows\Resources\svchost.exe

Filesize
135KB

MD5
524c06dc4550f5f0ad7b6f6e715893f8

SHA1
50826006d7cc5c18df108e48a66d767a0d4950a3

SHA256
dd51571c4114f4626f6436a2cbced665cbf90e46604429f9d8af7856dc88d864

SHA512
05cd3ebe2380a72dbceaedcedb6a2ee82233012cb688387a94f2d6e04218c37701967254fb3a873548a0ba515bd649b1ecc45698049d027286c81c5ad64e4a07

Download Submit
memory/2276-0-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2276-63-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2276-17-0x0000000000300000-0x000000000031F000-memory.dmp

Filesize
124KB

Download
memory/2296-70-0x000000001B020000-0x000000001B0A0000-memory.dmp

Filesize
512KB

Download
memory/2296-71-0x000000001B020000-0x000000001B0A0000-memory.dmp

Filesize
512KB

Download
memory/2296-9-0x0000000000140000-0x0000000000172000-memory.dmp

Filesize
200KB

Download
memory/2296-79-0x000000001B020000-0x000000001B0A0000-memory.dmp

Filesize
512KB

Download
memory/2296-10-0x000007FEF5150000-0x000007FEF5B3C000-memory.dmp

Filesize
9.9MB

Download
memory/2296-78-0x000000001B020000-0x000000001B0A0000-memory.dmp

Filesize
512KB

Download
memory/2296-77-0x000000001B020000-0x000000001B0A0000-memory.dmp

Filesize
512KB

Download
memory/2296-12-0x000000001B020000-0x000000001B0A0000-memory.dmp

Filesize
512KB

Download
memory/2296-67-0x000007FEF5150000-0x000007FEF5B3C000-memory.dmp

Filesize
9.9MB

Download
memory/2296-11-0x000000001B020000-0x000000001B0A0000-memory.dmp

Filesize
512KB

Download
memory/2296-64-0x000000001B020000-0x000000001B0A0000-memory.dmp

Filesize
512KB

Download
memory/2552-62-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2552-28-0x0000000000310000-0x000000000032F000-memory.dmp

Filesize
124KB

Download
memory/2564-61-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2564-51-0x0000000000370000-0x000000000038F000-memory.dmp

Filesize
124KB

Download
memory/2564-41-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2596-60-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download