r77 | a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb

Analysis

max time kernel
152s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-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-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\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
behavioral2/files/0x000800000002322f-7.dat	r77_payload

Executes dropped EXE 6 IoCs

pid	Process
3308	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
4940	icsys.icn.exe
3968	explorer.exe
5048	spoolsv.exe
4952	svchost.exe
4852	spoolsv.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"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\resources\\svchost.exe RO"	svchost.exe
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

Drops file in System32 directory 2 IoCs

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

Drops file in Windows directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Resources\Themes\icsys.icn.exe	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
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

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
4940	icsys.icn.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
3968	explorer.exe
4952	svchost.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3308	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
4940	icsys.icn.exe
4940	icsys.icn.exe
3968	explorer.exe
3968	explorer.exe
5048	spoolsv.exe
5048	spoolsv.exe
4952	svchost.exe
4952	svchost.exe
4852	spoolsv.exe
4852	spoolsv.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 1132 wrote to memory of 3308	1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	95
PID 1132 wrote to memory of 3308	1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	95
PID 1132 wrote to memory of 4940	1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	97
PID 1132 wrote to memory of 4940	1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	97
PID 1132 wrote to memory of 4940	1132	a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe	97
PID 4940 wrote to memory of 3968	4940	icsys.icn.exe	98
PID 4940 wrote to memory of 3968	4940	icsys.icn.exe	98
PID 4940 wrote to memory of 3968	4940	icsys.icn.exe	98
PID 3968 wrote to memory of 5048	3968	explorer.exe	100
PID 3968 wrote to memory of 5048	3968	explorer.exe	100
PID 3968 wrote to memory of 5048	3968	explorer.exe	100
PID 5048 wrote to memory of 4952	5048	spoolsv.exe	101
PID 5048 wrote to memory of 4952	5048	spoolsv.exe	101
PID 5048 wrote to memory of 4952	5048	spoolsv.exe	101
PID 4952 wrote to memory of 4852	4952	svchost.exe	102
PID 4952 wrote to memory of 4852	4952	svchost.exe	102
PID 4952 wrote to memory of 4852	4952	svchost.exe	102

C:\Users\Admin\AppData\Local\Temp\a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
"C:\Users\Admin\AppData\Local\Temp\a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1132
- \??\c:\users\admin\appdata\local\temp\a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
  c:\users\admin\appdata\local\temp\a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:3308
- C:\Windows\Resources\Themes\icsys.icn.exe
  C:\Windows\Resources\Themes\icsys.icn.exe
  2⤵
  - Executes dropped EXE
  - Drops file in Windows directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4940
- - \??\c:\windows\resources\themes\explorer.exe
    c:\windows\resources\themes\explorer.exe
    3⤵
    - Modifies visiblity of hidden/system files in Explorer
    - Executes dropped EXE
    - Adds Run key to start application
    - Drops file in System32 directory
    - Drops file in Windows directory
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3968
  - - \??\c:\windows\resources\spoolsv.exe
      c:\windows\resources\spoolsv.exe SE
      4⤵
      Executes dropped EXE
      Drops file in Windows directory
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:5048
    - - \??\c:\windows\resources\svchost.exe
        
        c:\windows\resources\svchost.exe
        5⤵
        Modifies visiblity of hidden/system files in Explorer
        Executes dropped EXE
        Adds Run key to start application
        Drops file in System32 directory
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:4952
      - \??\c:\windows\resources\spoolsv.exe
        
        c:\windows\resources\spoolsv.exe PR
        6⤵
        Executes dropped EXE
        Suspicious use of SetWindowsHookEx
        
        PID:4852

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=3940 --field-trial-handle=2284,i,15722001240173834669,15048020084704567542,262144 --variations-seed-version /prefetch:8
1⤵
PID:1640

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

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:\Users\Admin\AppData\Local\Temp\a2c7b7cc8423b1efec7868a8448730790a86a5fe45603441ed492131d197adeb.exe

Filesize
1.1MB

MD5
cc63fa843ab94603b970a6e653f4f13b

SHA1
6fd8e1fc257153926c2e499b0663b3cdbebd5b34

SHA256
6d64edfae65a6cd656ef6cdb9e1a477de984f224e72ae3b3e6fdee9b33ed7f71

SHA512
ba2d92beee1a74bffd45ef8b56eed59da79d61ec9ebee01bbc2c35986be7569d9ed78ac3063c5e5f67a64b7eb96ac87f939757e7a20c22bf0b194b2aefc2db8b

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

Filesize
135KB

MD5
9cac75e581b402c010f142155bf3cd18

SHA1
309e0101475c8905afc78c91dc519a05c24b9605

SHA256
87e6e4db0873efd37bcc824f563bfc7ed4f0836b4a87320f111e0cade6096382

SHA512
0b3c08429e81f5f7a9da53eb8c795c1eae0fb80392cc6468313c22f170254de36691465fe6b771a1757c6d42143cecffdf5d6c1f517298ba80f23f3f9acba84b

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

Filesize
135KB

MD5
db9cbf2cb097b6e0cf12ee854a6ecde5

SHA1
5021461b8b376c7ddb8a066685499cb4198e0537

SHA256
2c58393f8551bba71f450bffab74aa7fc8f4d90dc01dbd0560aaf9d00f3b4977

SHA512
a934ea569b8a8742400c21830d1c65ac667b10a9adcb69851116792a8bbe693e09996db0b5d95e798349782486da2620fe3a7618d476c3910c5877daed60abc8

Download Submit
C:\Windows\Resources\spoolsv.exe

Filesize
135KB

MD5
5734768e5ab06ba0baace76aeed14f10

SHA1
ebee3f707eab2e5f6f9c6a00d381024acbf6cae0

SHA256
4cb00250d668804fd47844f5eafe699254c9e7a4de465f3a1e708a08ce3e7a1f

SHA512
6ec173903f0c7a0eb2bd6c48842044f58837bb4cb823f72625e37c80e53073796f588b3d19d340f1e27447a31da00ef7509959b9412862e36fd02ca9f6e412f1

Download Submit
\??\c:\windows\resources\svchost.exe

Filesize
135KB

MD5
f371616e3cd29c9ce0549ff5f7658fe8

SHA1
de43f7c467ad7ce14cd1cc033066b33d35c918a7

SHA256
84b334c23bf13692a3c064306e413271e7b5ea7a041fb4145fec163ead812f61

SHA512
75fc9acf8c7582fa50b4e9c42166396b69c7714a1d695103ce68cfdbc10c2778251061c568b9ae97b165b27fcce7ae71856758fab6db466c8815a622e8159cad

Download Submit
memory/1132-0-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1132-52-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3308-10-0x00007FF9838B0000-0x00007FF984371000-memory.dmp

Filesize
10.8MB

Download
memory/3308-55-0x00007FF9838B0000-0x00007FF984371000-memory.dmp

Filesize
10.8MB

Download
memory/3308-13-0x000002574BC80000-0x000002574BC90000-memory.dmp

Filesize
64KB

Download
memory/3308-12-0x000002574BC80000-0x000002574BC90000-memory.dmp

Filesize
64KB

Download
memory/3308-11-0x000002574BC80000-0x000002574BC90000-memory.dmp

Filesize
64KB

Download
memory/3308-9-0x000002574B890000-0x000002574B8C2000-memory.dmp

Filesize
200KB

Download
memory/3308-54-0x000002574BC80000-0x000002574BC90000-memory.dmp

Filesize
64KB

Download
memory/3308-53-0x000002574BC80000-0x000002574BC90000-memory.dmp

Filesize
64KB

Download
memory/4852-49-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4940-51-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4940-17-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/5048-50-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download