nymaim | 96d731e3eeccd16f7e02381bc437f3b0674c3b990255a813ef2f43311c5dc778

General

Target

file.exe
Size

2.4MB
MD5

148ef6355876ea127b0f720d7d625b88
SHA1

19e16d6e264e888a462e11f24c8767399bf34226
SHA256

96d731e3eeccd16f7e02381bc437f3b0674c3b990255a813ef2f43311c5dc778
SHA512

0f9c3a212acdc66374291e134feb17d06be7f0cd3704dd2d56370433984dd93ab3c285a86665c971b5cdd375ba07eab864933e3772a6768886b771d547f4f0d0
SSDEEP

49152:Z2Nbq+lhVmT8q75ZMolGIA9KqnqzRUiIiKpn+JZbyEd/tGrl0nbJvr2hbsLEu3AW:M1th8T8iMolGIrAq1IiG+JZbzpArlStT

Score

10^/10

nymaim discovery trojan

Malware Config

Extracted

Family

nymaim

C2

45.15.156.54

85.31.46.167

Signatures

NyMaim
NyMaim is a malware with various capabilities written in C++ and first seen in 2013.
trojan nymaim

Executes dropped EXE 3 IoCs

pid	Process
3776	is-BVTNC.tmp
4912	efsearcher51.exe
4264	AkJUsZ.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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	efsearcher51.exe

Loads dropped DLL 1 IoCs

pid	Process
3776	is-BVTNC.tmp

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Drops file in Program Files directory 12 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\efSearcher\unins000.dat	is-BVTNC.tmp
File created	C:\Program Files (x86)\efSearcher\unins000.dat	is-BVTNC.tmp
File created	C:\Program Files (x86)\efSearcher\is-TSTKB.tmp	is-BVTNC.tmp
File created	C:\Program Files (x86)\efSearcher\is-OAGQ1.tmp	is-BVTNC.tmp
File created	C:\Program Files (x86)\efSearcher\is-6FQ2R.tmp	is-BVTNC.tmp
File created	C:\Program Files (x86)\efSearcher\is-7I5QH.tmp	is-BVTNC.tmp
File opened for modification	C:\Program Files (x86)\efSearcher\efsearcher51.exe	is-BVTNC.tmp
File created	C:\Program Files (x86)\efSearcher\is-DF2DR.tmp	is-BVTNC.tmp
File created	C:\Program Files (x86)\efSearcher\is-MJVMJ.tmp	is-BVTNC.tmp
File created	C:\Program Files (x86)\efSearcher\is-FGKGK.tmp	is-BVTNC.tmp
File created	C:\Program Files (x86)\efSearcher\is-HGBD9.tmp	is-BVTNC.tmp
File created	C:\Program Files (x86)\efSearcher\is-LLROT.tmp	is-BVTNC.tmp

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

System Information Discovery
T1082

Kills process with taskkill 1 IoCs

evasion

pid	Process
4476	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4912	efsearcher51.exe
4912	efsearcher51.exe
4912	efsearcher51.exe
4912	efsearcher51.exe
4912	efsearcher51.exe
4912	efsearcher51.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4476	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4860 wrote to memory of 3776	4860	file.exe	82
PID 4860 wrote to memory of 3776	4860	file.exe	82
PID 4860 wrote to memory of 3776	4860	file.exe	82
PID 3776 wrote to memory of 4912	3776	is-BVTNC.tmp	83
PID 3776 wrote to memory of 4912	3776	is-BVTNC.tmp	83
PID 3776 wrote to memory of 4912	3776	is-BVTNC.tmp	83
PID 4912 wrote to memory of 4264	4912	efsearcher51.exe	84
PID 4912 wrote to memory of 4264	4912	efsearcher51.exe	84
PID 4912 wrote to memory of 4264	4912	efsearcher51.exe	84
PID 4912 wrote to memory of 4460	4912	efsearcher51.exe	92
PID 4912 wrote to memory of 4460	4912	efsearcher51.exe	92
PID 4912 wrote to memory of 4460	4912	efsearcher51.exe	92
PID 4460 wrote to memory of 4476	4460	cmd.exe	94
PID 4460 wrote to memory of 4476	4460	cmd.exe	94
PID 4460 wrote to memory of 4476	4460	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4860
- C:\Users\Admin\AppData\Local\Temp\is-IAIAG.tmp\is-BVTNC.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-IAIAG.tmp\is-BVTNC.tmp" /SL4 $901C8 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2255599 52736
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:3776
- - C:\Program Files (x86)\efSearcher\efsearcher51.exe
    "C:\Program Files (x86)\efSearcher\efsearcher51.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4912
  - - C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\AkJUsZ.exe
      4⤵
      Executes dropped EXE
      PID:4264
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "efsearcher51.exe" /f & erase "C:\Program Files (x86)\efSearcher\efsearcher51.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4460
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "efsearcher51.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4476

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Program Files (x86)\efSearcher\efsearcher51.exe

Filesize
4.0MB

MD5
a3b2b7f0f18bf7c8f180a7bed31af73a

SHA1
d9f6cc82b7a0d522f59dbe8bf017282c076e7695

SHA256
3c241e8e778ebf32bf607e4adb5f86374cc92c7552af5592e260fd40d973fb7d

SHA512
c4ffc77be3e94c6cc17618fb5ccbeb8cd8eea7e2145929509f39f722862733d011ed57e1e483771a2ba574c56738d2f0363c4f0029d8ba42977dab8f61401c20

Download Submit
C:\Program Files (x86)\efSearcher\efsearcher51.exe

Filesize
4.0MB

MD5
a3b2b7f0f18bf7c8f180a7bed31af73a

SHA1
d9f6cc82b7a0d522f59dbe8bf017282c076e7695

SHA256
3c241e8e778ebf32bf607e4adb5f86374cc92c7552af5592e260fd40d973fb7d

SHA512
c4ffc77be3e94c6cc17618fb5ccbeb8cd8eea7e2145929509f39f722862733d011ed57e1e483771a2ba574c56738d2f0363c4f0029d8ba42977dab8f61401c20

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-IAIAG.tmp\is-BVTNC.tmp

Filesize
657KB

MD5
7cd12c54a9751ca6eee6ab0c85fb68f5

SHA1
76562e9b7888b6d20d67addb5a90b68b54a51987

SHA256
e82cabb027db8846c3430be760f137afa164c36f9e1b93a6e34c96de0b2c5a5f

SHA512
27ba5d2f719aaac2ead6fb42f23af3aa866f75026be897cd2f561f3e383904e89e6043bd22b4ae24f69787bd258a68ff696c09c03d656cbf7c79c2a52d8d82cc

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-IAIAG.tmp\is-BVTNC.tmp

Filesize
657KB

MD5
7cd12c54a9751ca6eee6ab0c85fb68f5

SHA1
76562e9b7888b6d20d67addb5a90b68b54a51987

SHA256
e82cabb027db8846c3430be760f137afa164c36f9e1b93a6e34c96de0b2c5a5f

SHA512
27ba5d2f719aaac2ead6fb42f23af3aa866f75026be897cd2f561f3e383904e89e6043bd22b4ae24f69787bd258a68ff696c09c03d656cbf7c79c2a52d8d82cc

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-OAV43.tmp\_isetup\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\AkJUsZ.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\AkJUsZ.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/4860-151-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4860-132-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4860-134-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4860-156-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/4912-143-0x0000000000400000-0x00000000015F8000-memory.dmp

Filesize
18.0MB

Download
memory/4912-142-0x0000000000400000-0x00000000015F8000-memory.dmp

Filesize
18.0MB

Download
memory/4912-147-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/4912-152-0x0000000000400000-0x00000000015F8000-memory.dmp

Filesize
18.0MB

Download
memory/4912-155-0x0000000000400000-0x00000000015F8000-memory.dmp

Filesize
18.0MB

Download

Analysis

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